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A circuit coil of radius 20 cm and 20 tu...

A circuit coil of radius 20 cm and 20 turns of wire is mounted vertically with it's plane in the magnetic meridian. A small magnetic needle placed at the center of the coil is deflected through `45^(@)` when a current is passed through the coil. What is the value of the current? (horizontal induction of earth's field = `3.6x 10^(-5)Wb//m^(2)`

A

0.6A

B

6A

C

`6xx10^(-3)A`

D

0.06A

Text Solution

Verified by Experts

The correct Answer is:
A
The needle of deflected through `45^(@)` means magnetic field at the centre of cicular coil is equal (in magnitude) to the horizontal component of earth's magnetic field.
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