Moving Charges And Magnetism

Physics
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The following cases in which no force is exerted by a magnetic field on a charge is

A
moving with constant velocity
B
moving in a circle
C
at rest
D
moving along a curved path
Easy
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A proton moving in a straight line enters a strong magnetic field along the field direction then its path and velocity will be

A
path is circular but speed constant
B
path is same but velocity increases
C
path is same and velocity remains constant
D
path is same and motion is retarded
Easy
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A charge moving with velocity v in X - direction is subjected to a field of magnetic induction in the negative X direction. As a result the charge will

A
retard along X-axis
B
move along a helical path around X axis
C
remain unaffected
D
starts moving in a circular path
Easy
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If an electron of velocity is is subjected to magnetic field of , then, for the electron ,

A
speed will change
B
path will change
C
velocity is Constant
D
momentum is Constant
Easy
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