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Permanent magnet has properties retentivity and coercivity respectively

Physics-General

  1. High-high    
  2. Low-low    
  3. Low-high    
  4. High-low    

    Answer:The correct answer is: High-highThe materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields). As the material in this case is never put to cyclic changes of magnetization, hence hysteresis is immaterial.

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    General
    physics-

    The magnetic susceptibility of a paramagnetic substance at negative 73 degree C is 0.0060, then its value atnegative 173 degreeC will be

    X subscript m end subscript proportional to fraction numerator 1 over denominator T end fraction comma Therefore,
    fraction numerator X subscript 2 end subscript over denominator X subscript 1 end subscript end fraction equals fraction numerator T subscript 1 end subscript over denominator T subscript 2 end subscript end fraction
    fraction numerator X subscript 2 end subscript over denominator 0.0060 end fraction equals fraction numerator 273 minus 73 over denominator 273 minus 173 end fraction equals fraction numerator 200 over denominator 100 end fraction equals 2
    Or X subscript 2 end subscript equals 2 cross times 0.0060 equals 0.0120

    The magnetic susceptibility of a paramagnetic substance at negative 73 degree C is 0.0060, then its value atnegative 173 degreeC will be

    physics-General
    X subscript m end subscript proportional to fraction numerator 1 over denominator T end fraction comma Therefore,
    fraction numerator X subscript 2 end subscript over denominator X subscript 1 end subscript end fraction equals fraction numerator T subscript 1 end subscript over denominator T subscript 2 end subscript end fraction
    fraction numerator X subscript 2 end subscript over denominator 0.0060 end fraction equals fraction numerator 273 minus 73 over denominator 273 minus 173 end fraction equals fraction numerator 200 over denominator 100 end fraction equals 2
    Or X subscript 2 end subscript equals 2 cross times 0.0060 equals 0.0120
    General
    physics-

    If a magnetic substance is kept in a magnetic field then which of the following substance is thrown out?

    Magnetic substance when kept in a magnetic field is feebly repelled or thrown out if the substance is diamagnetic.

    If a magnetic substance is kept in a magnetic field then which of the following substance is thrown out?

    physics-General
    Magnetic substance when kept in a magnetic field is feebly repelled or thrown out if the substance is diamagnetic.
    General
    physics-

    Curie temperature is the one above which

    The curie temperature or curie point of a ferromagnetic material is the temperature above which it looses its characteristic ferromagnetic ability to possess a net magnetization in the absence of an external magnetic field. Hence, above curie temperature material is purely paramagnetic.

    Curie temperature is the one above which

    physics-General
    The curie temperature or curie point of a ferromagnetic material is the temperature above which it looses its characteristic ferromagnetic ability to possess a net magnetization in the absence of an external magnetic field. Hence, above curie temperature material is purely paramagnetic.
    General
    physics-

    Which of the following is represented by the area enclosed by a hysteresis loop (B-H curve)?

    Area enclosed by B minus H curve represents energy lost. If the area of hysteresis loop is less energy loss is low whereas if the area of hysteresis loop is large energy loss is high.

    Which of the following is represented by the area enclosed by a hysteresis loop (B-H curve)?

    physics-General
    Area enclosed by B minus H curve represents energy lost. If the area of hysteresis loop is less energy loss is low whereas if the area of hysteresis loop is large energy loss is high.
    General
    physics-

    For a paramagnetic material, the dependence of the magnetic susceptibility X on the absolute temperature is given as

    For paramagnetic materials, the magnetic susceptibility gives information on the molecular dipole moment and hence on the electronic structure of the molecules in the material. The paramagnetic contribution to the molar magnetic susceptibility of a material, X is related to the molecular magnetic moment Mby the Curie relation
    X equals c o n s t a n t cross times fraction numerator M over denominator T end fraction ⟹ X proportional to fraction numerator 1 over denominator T end fraction

    For a paramagnetic material, the dependence of the magnetic susceptibility X on the absolute temperature is given as

    physics-General
    For paramagnetic materials, the magnetic susceptibility gives information on the molecular dipole moment and hence on the electronic structure of the molecules in the material. The paramagnetic contribution to the molar magnetic susceptibility of a material, X is related to the molecular magnetic moment Mby the Curie relation
    X equals c o n s t a n t cross times fraction numerator M over denominator T end fraction ⟹ X proportional to fraction numerator 1 over denominator T end fraction
    General
    physics-

    Susceptibility of ferromagnetic substance is

    Susceptibility of ferromagnetic substance is

    physics-General
    General
    physics

    Shape of the graph of position not stretchy rightwards arrowtime given in the figure for a body shows that

    Shape of the graph of position not stretchy rightwards arrowtime given in the figure for a body shows that

    physicsGeneral
    General
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    As shown in the figure particle P moves from A to B and particle Q moves from C to D. Displacements for P and Q are  and y respectively then

    As shown in the figure particle P moves from A to B and particle Q moves from C to D. Displacements for P and Q are  and y respectively then

    physicsGeneral
    General
    physics

    Here is a cube made from twelve wire each of length L, An ant goes from A to G  through path A-B-C-G. Calculate the displacement.

    Here is a cube made from twelve wire each of length L, An ant goes from A to G  through path A-B-C-G. Calculate the displacement.

    physicsGeneral
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    As shown in the figure a particle starts its motion from 0 to A. And then it moves from. A to B. Error converting from MathML to accessible text. Is an are find the Path length

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    physicsGeneral
    General
    maths-

    Assertion (A): 2 to the power of 4 n end exponent minus 2 to the power of n end exponent left parenthesis 7 n plus 1 right parenthesis is divisible by the square of14 where n is a natural number Reason (R): left parenthesis 1 plus x right parenthesis to the power of n end exponent equals 1 plus to the power of n end exponent C subscript 1 end subscript x plus horizontal ellipsis. plus to the power of n end exponent C subscript n end subscript x to the power of n end exponent for all n element of N

    Assertion (A): 2 to the power of 4 n end exponent minus 2 to the power of n end exponent left parenthesis 7 n plus 1 right parenthesis is divisible by the square of14 where n is a natural number Reason (R): left parenthesis 1 plus x right parenthesis to the power of n end exponent equals 1 plus to the power of n end exponent C subscript 1 end subscript x plus horizontal ellipsis. plus to the power of n end exponent C subscript n end subscript x to the power of n end exponent for all n element of N

    maths-General
    General
    maths-

    Assertion (A): Number of the dissimilar terms
    in the sum of expansion left parenthesis x plus a right parenthesis to the power of 102 end exponent plus left parenthesis x minus a right parenthesis to the power of 102 end exponent is 206
    Reason (R): Number of terms in the expansion of left parenthesis x plus b right parenthesis to the power of n end exponent is n+1

    Number of terms 52

    Assertion (A): Number of the dissimilar terms
    in the sum of expansion left parenthesis x plus a right parenthesis to the power of 102 end exponent plus left parenthesis x minus a right parenthesis to the power of 102 end exponent is 206
    Reason (R): Number of terms in the expansion of left parenthesis x plus b right parenthesis to the power of n end exponent is n+1

    maths-General
    Number of terms 52
    General
    maths-

    I f A equals left parenthesis 300 right parenthesis to the power of 600 end exponent comma B=600!, C equals left parenthesis 200 right parenthesis to the power of 600 end exponent then

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    maths-General
    General
    maths-

    The arrangement of the following with respect to coefficient of x to the power of r end exponent in ascending order where vertical line x vertical line less than 1 A) x to the power of 5 end exponent in left parenthesis 1 minus x right parenthesis to the power of negative 3 end exponent where vertical line x vertical line less than 1 B) x to the power of 7 end exponent i n left parenthesis 1 plus 2 x plus 3 x to the power of 2 end exponent plus horizontal ellipsis infinity right parenthesiswhere vertical line x vertical line less than 1 C) x to the power of 10 end exponent in left parenthesis 1 plus x right parenthesis to the power of negative 1 end exponent where vertical line x vertical line less than 1 D) x to the power of 3 end exponent in left parenthesis 1 plus x right parenthesis to the power of 4 end exponent

    The arrangement of the following with respect to coefficient of x to the power of r end exponent in ascending order where vertical line x vertical line less than 1 A) x to the power of 5 end exponent in left parenthesis 1 minus x right parenthesis to the power of negative 3 end exponent where vertical line x vertical line less than 1 B) x to the power of 7 end exponent i n left parenthesis 1 plus 2 x plus 3 x to the power of 2 end exponent plus horizontal ellipsis infinity right parenthesiswhere vertical line x vertical line less than 1 C) x to the power of 10 end exponent in left parenthesis 1 plus x right parenthesis to the power of negative 1 end exponent where vertical line x vertical line less than 1 D) x to the power of 3 end exponent in left parenthesis 1 plus x right parenthesis to the power of 4 end exponent

    maths-General
    General
    maths-

    A: If the term independent of x in the expansion of left parenthesis square root of x minus fraction numerator n over denominator x to the power of 2 end exponent end fraction right parenthesis to the power of 10 end exponent is 405, then n=
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    C: If in the binomial expansion of left parenthesis 1 plus x right parenthesis to the power of n end exponent comma the coefficients of 5thcomma 6th and 7th terms are in A.P then n= [Arranging the values of n in ascending order]

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    B: If the third term in the expansion of left parenthesis fraction numerator 1 over denominator n end fraction plus n to the power of l o g subscript n end subscript 10 end exponent right parenthesis to the power of 5 end exponent is 1000, then n=(here n<10)
    C: If in the binomial expansion of left parenthesis 1 plus x right parenthesis to the power of n end exponent comma the coefficients of 5thcomma 6th and 7th terms are in A.P then n= [Arranging the values of n in ascending order]

    maths-General