General
Easy
Physics-

A particle of mass m and charge q, moving with velocity V enters Region II normal to the boundary as shown in fig Region II has a uniform magnetic field B perpendicular to the plane of the paper The length of the Region II is l Then

Physics-General

  1. The particle enters Region III only if its velocity V greater than fraction numerator q l B over denominator m end fraction    
  2. Path length of the particle in region II is maximum when velocity V equals fraction numerator q l B over denominator m end fraction    
  3. Time spent in Region II is same for any velocity V as long as the particle returns to Region I    
  4. All the above are correct    

    Answer:The correct answer is: All the above are correct

    Book A Free Demo

    +91

    Grade

    Related Questions to study

    General
    physics-

    A proton accelerated by a pd V=500 KV moves through a transverse magnetic field B=0.51 T as shown in figure Then the angle q through which the proton deviates from the initial direction of its motion is (approximately)

       

    A proton accelerated by a pd V=500 KV moves through a transverse magnetic field B=0.51 T as shown in figure Then the angle q through which the proton deviates from the initial direction of its motion is (approximately)

    physics-General
       
    General
    physics-

    A small sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The force acting on the sphere are shown in figure. Which of the following statements is wrong?

    Here W=T(cosθ+sinθ)<T so P+Q=T(cosθ+sinθ)<T Whereas [a], [b] and [c] are correct and [d] is wrong.    

    A small sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The force acting on the sphere are shown in figure. Which of the following statements is wrong?

    physics-General
    Here W=T(cosθ+sinθ)<T so P+Q=T(cosθ+sinθ)<T Whereas [a], [b] and [c] are correct and [d] is wrong.    
    General
    physics-

    Two 1ong wires are placed parallel to each other 10cm apart as shown in fig The magnetic field at piont P is

       

    Two 1ong wires are placed parallel to each other 10cm apart as shown in fig The magnetic field at piont P is

    physics-General
       
    General
    physics-

    A circular loop of radius 20cm is placed in a uniform magnetic field B=2T in X-Yplane the loop carries a current 1A in the direction shown in figure The magnitude of torque acting on the loop is nearly

       

    A circular loop of radius 20cm is placed in a uniform magnetic field B=2T in X-Yplane the loop carries a current 1A in the direction shown in figure The magnitude of torque acting on the loop is nearly

    physics-General
       
    General
    maths-

    Ltxπ2sec xtan xπ2x

    Ltxπ2sec xtan xπ2x

    maths-General
    General
    chemistry-

    C-O-C angle would be maximum in

    C-O-C angle would be maximum in

    chemistry-General
    General
    maths-

    Let f : (0, ¥) → R and F(x) = 0xt f (t) dt. If F (x2) = x4 + x5, then r=112f(r2), is equal to

       

    Let f : (0, ¥) → R and F(x) = 0xt f (t) dt. If F (x2) = x4 + x5, then r=112f(r2), is equal to

    maths-General
       
    General
    maths-

    Ltx0 x2xx1cos x

    Ltx0 x2xx1cos x

    maths-General
    General
    maths-

    Ltxπ2[sec 3xcos 5x]

    Ltxπ2[sec 3xcos 5x]

    maths-General
    General
    maths-

    Ltx0etan xextan xx

    Ltx0etan xextan xx

    maths-General
    General
    physics-

    The time taken by the projectile to reach from A to B is t, then the distance AB is equal to

    Horizontal component of velocity at A vH=ucos60°=u2 AC=uH×t=ut2 AB=ACsec30°=ut2×23=ut2    

    The time taken by the projectile to reach from A to B is t, then the distance AB is equal to

    physics-General
    Horizontal component of velocity at A vH=ucos60°=u2 AC=uH×t=ut2 AB=ACsec30°=ut2×23=ut2    
    General
    physics-

    In figure, a particle is placed at the highest point A of a smooth sphere of radius r. It is given slight push, and it leaves the sphere at B, at a depth h vertically below A such that h is equal to

    If v velocity acquired at B, then v2=2gh The particle will leave the sphere at B, when mv2rmgcosθ 2ghr=g(r-h)r, Which gives h=r3    

    In figure, a particle is placed at the highest point A of a smooth sphere of radius r. It is given slight push, and it leaves the sphere at B, at a depth h vertically below A such that h is equal to

    physics-General
    If v velocity acquired at B, then v2=2gh The particle will leave the sphere at B, when mv2rmgcosθ 2ghr=g(r-h)r, Which gives h=r3    
    General
    chemistry-

    The enzyme pepsin hydrolyses:

    The enzyme pepsin hydrolyses:

    chemistry-General
    General
    physics-

    A particle originally at rest at the highest point of a smooth vertical circle is slightly displaced. It will leave the circle at a vertical distance h below the highest point such that

       

    A particle originally at rest at the highest point of a smooth vertical circle is slightly displaced. It will leave the circle at a vertical distance h below the highest point such that

    physics-General
       
    General
    physics-

    The magnetic induction at the point O, if the wire carrying current I is

       

    The magnetic induction at the point O, if the wire carrying current I is

    physics-General