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Question

A long straight neutral conductor carries a current l. Assume that all the free electrons in the conductor move with the same velocity v. A is a stationary observer while B is moving same velocity v parallel to the conductor


A

A and B both observe non- zero magnetic field

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B

A and B both observe zero electric field

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C

A and B both observe approximately the same current i.

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D

A observes zero electric field while the electric field observed by B is non-zero

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Solution

The correct options are
A

A and B both observe non- zero magnetic field


C

A and B both observe approximately the same current i.


D

A observes zero electric field while the electric field observed by B is non-zero


Both the observer will see the same current as the current signifies the amount of charge crossing a cross-sectional area per second, which is going to remain the same whether the observer is moving or stationary. Similarly, in a current carrying wire there is magnetic field present in its surrounding, therefore both the person will observe non zero magnetic field.


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