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  • A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field far away is.<div class='qna-optio

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field far away is.

Option: 1

twice the earlier value.


Option: 2

same as the earlier value.


Option: 3

one-half of the earlier value.


Option: 4

one-quarter of the earlier value.


Answers (1)

best_answer

\mathrm{ B =\frac{\mu_0 \mathrm{i}}{2 \pi \mathrm{r}}}  and so it is independent of thickness.
The current is same in both the wires, hence magnetic field induced will be same.

Posted by

seema garhwal

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