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A current of 30A is flowing in a vertica...

A current of `30A` is flowing in a vertical straight wire. If the horizontal component of earths magnetic is `2xx10^(-5)T`, then the position of null point will be

A

0.9m

B

0.3mm

C

0.3cm

D

0.3m

Text Solution

Verified by Experts

The correct Answer is:
D
`H = (mu_0 i)/(2pi r)`
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