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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)/(2pir)`
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