A circular coil of radius 20 cm and 20 turns of wire is mounted vertically with its plane in magnetic meridian. A small magnetic needle (free to rotate about vertical axis) is placed at the center of the coil. It is deflected through 45 
when a current is passed through the coil in equilibrium Horizontal component of earth's field is 0.34 × 10 –4 T. The current in coil is:
A
B
6A
C
6 × 10 –3 A
D
Text Solution
Verified by ExpertsThe correct answer is:
A
We know magnetic field due to coil 
The needle is in equlibrium, 
the current in the coil , 
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