Moving Charges And Magnetism

Physics
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A current of i ampere is flowing through each ofthe bent wires as shown the magnitude and direction of magnetic field at O is

A
B
C
D
Hard
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A proton is fired from origin with velocity  in a uniform magnetic field . In the subsequent motion of the proton:

A
its z co-ordinate can never be negative
B
its x co-ordinate can never be positive
C
its x and z co-ordinates cannot be zero at the same time
D
its y co-ordinate will be proportional to its time of flight
Hard
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