NEET Physics Moving Charges and Magnetism Questions Solved


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Force on current - carrying wire segment,                  F=il×BFor AB portion, Bl                FAB=0Also for full loop, force is zero    FAB+FBC+FCA=0    O+FBC+F=0    FBC=-F

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When a proton is released from rest in a room, it stars with an initial acceleration a0 towards east. When it is projected towards north with a speed v0, it moves with initial acceleration 3a0 towards east. The electric and magnetic fields in the room are

1.  Ma0ewest, Ma0ev0up

2.  Ma0ewest, 2Ma0ev0down

3.  Ma0eeast, 2Ma0ev0up

4.  Ma0eeast, 3Ma0ev0down

(3)

Case 1:

                    ma0=e EE=ma0m east

Case 2:

                    Net force = Felectric+Fmag                      3ma0=eE+ev0B                       B=2ma0ev0 upward

Magnetic force=qV×B gives direction of magnetic field B

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(1)

For voltmeter, max. current imax=VGFor new voltmeter,

VAB=imax R+VnV=VRG+VR=n-1G   in series

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