Physics-
General
Easy

Question

The current through a 4.6 H inductor is shown in the following graph. The induced emf during the time interval t = 5 milli-sec to 6 milli-sec will be

  1. 103 V    
  2. – 23 '103 V    
  3. 23 ' 103 V    
  4. Zero    

The correct answer is: 23 ´ 103 V


    Rate of decay of current between t = 5 ms to 6 ms equals fraction numerator d i over denominator d t end fraction equals negative left parenthesis text Slope of the line  end text B C right parenthesis
    equals negative open parentheses fraction numerator 5 over denominator 1 cross times 1 0 to the power of negative 3 end exponent end fraction close parentheses equals negative 5 cross times 1 0 to the power of 3 end exponent A divided by s. Hence induced emf e equals negative L fraction numerator d i over denominator d t end fraction equals negative 4.6 cross times left parenthesis negative 5 cross times 1 0 to the power of 3 end exponent right parenthesis equals 23 cross times 1 0 to the power of 3 end exponent V.

    Related Questions to study

    General
    maths-

    Statement (1): Two perpendicular tangents of parabola y2 = 16x always meet on x + 4 = 0.
    Statement (2): Two perpendicular tangents of a parabola, always meets on axis.

    Statement (1): Two perpendicular tangents of parabola y2 = 16x always meet on x + 4 = 0.
    Statement (2): Two perpendicular tangents of a parabola, always meets on axis.

    maths-General
    General
    maths-

    Statement (1): The curve 9y2 –16x –12y –57 = 0 is symmetric about line 3y = 2.
    Statement (2): A parabola is symmetric about it’s axis.

    Statement (1): The curve 9y2 –16x –12y –57 = 0 is symmetric about line 3y = 2.
    Statement (2): A parabola is symmetric about it’s axis.

    maths-General
    General
    maths-

    y2 = 4x is the equation of a parabola.
    Assertion : Through (lambda comma lambda + 1), 3 normals can be drawn to the parabola, if lambda< 2
    Reason : The point (lambda comma lambda + 1) lies outside the parabola for all lambda not equal to –1.

    y2 = 4x is the equation of a parabola.
    Assertion : Through (lambda comma lambda + 1), 3 normals can be drawn to the parabola, if lambda< 2
    Reason : The point (lambda comma lambda + 1) lies outside the parabola for all lambda not equal to –1.

    maths-General
    parallel
    General
    maths-

    Assertion (A) : In given fig., Length of ST = 8

    Reason (R) : The tangents at point P and Q on parabola meet in T, then ST2 = SP. SQ.

    Assertion (A) : In given fig., Length of ST = 8

    Reason (R) : The tangents at point P and Q on parabola meet in T, then ST2 = SP. SQ.

    maths-General
    General
    physics-

    The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

    The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

    physics-General
    General
    physics-

    The graph Shows the variation in magnetic flux phi left parenthesis t right parenthesis with time through a coil. Which of the statements given below is not correct

    The graph Shows the variation in magnetic flux phi left parenthesis t right parenthesis with time through a coil. Which of the statements given below is not correct

    physics-General
    parallel
    General
    physics-

    A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle 2 theta. The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is

    A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle 2 theta. The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is

    physics-General
    General
    physics-

    The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of 1 0 to the power of 3 end exponent A divided by s then V subscript A end subscript minus V subscript B end subscript is

    The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of 1 0 to the power of 3 end exponent A divided by s then V subscript A end subscript minus V subscript B end subscript is

    physics-General
    General
    physics-

    The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (i) just after the switch is closed and (ii) a long time later, greatest first

    The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (i) just after the switch is closed and (ii) a long time later, greatest first

    physics-General
    parallel
    General
    physics-

    What is the mutual inductance of a two-loop system as shown with centre separation l

    What is the mutual inductance of a two-loop system as shown with centre separation l

    physics-General
    General
    Maths-

    Assertion (A) : The length of latus rectum in fig is 24/5.

    Reason (R) : If l 1 and l2are length of segments of a focal chord of a parabola, then its latus rectum is fraction numerator 4 l subscript 1 end subscript l subscript 2 end subscript over denominator l subscript 1 end subscript plus l subscript 2 end subscript end fraction.

    Assertion (A) : The length of latus rectum in fig is 24/5.

    Reason (R) : If l 1 and l2are length of segments of a focal chord of a parabola, then its latus rectum is fraction numerator 4 l subscript 1 end subscript l subscript 2 end subscript over denominator l subscript 1 end subscript plus l subscript 2 end subscript end fraction.

    Maths-General
    General
    maths-

    Assertion: Through (lambda comma lambda + 1) there can not the more than one normal to the parabola y2 = 4x if + lambda < 2.
    Reason: The point (lambda comma lambda + 1) lie out side the parabola for all lambdanot equal to 1.

    Assertion: Through (lambda comma lambda + 1) there can not the more than one normal to the parabola y2 = 4x if + lambda < 2.
    Reason: The point (lambda comma lambda + 1) lie out side the parabola for all lambdanot equal to 1.

    maths-General
    parallel
    General
    maths-

    The point of intersection of the tangents at the ends of the latus rectum of the parabola y2 = 4x is .

    The point of intersection of the tangents at the ends of the latus rectum of the parabola y2 = 4x is .

    maths-General
    General
    maths-

    If a ≠ 0 and the line 2bx + 3cy + 4d = 0 passes through the points of intersection of the parabolas y to the power of 2 end exponent = 4ax and x to the power of 2 end exponent = 4ay, then-

    If a ≠ 0 and the line 2bx + 3cy + 4d = 0 passes through the points of intersection of the parabolas y to the power of 2 end exponent = 4ax and x to the power of 2 end exponent = 4ay, then-

    maths-General
    General
    maths-

    If M is the foot of perpendicular from a point P of a parabola y2 = 4ax to its directrix and SPM is an equilateral triangle, where S is the focus. Then SP equal to-

    If M is the foot of perpendicular from a point P of a parabola y2 = 4ax to its directrix and SPM is an equilateral triangle, where S is the focus. Then SP equal to-

    maths-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.