A straight infinite wire carries steady current of 2 A. The strength of magnetic field due to this wire at a fixed point in its vicinity will?

Change with time

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Remain constant with time

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may change or remain constant depending upon the point chosen

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None of these

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Solution

The correct option is B Remain constant with time
As the wire is infinite and all the charges are moving at a constant speed, the magnetic field will not change at any point around it.

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