The earth's magnetic field at a given point is 0.5 × 10-5 Wbm-2. This field is to be annulled by magnetic induction at the centre of a circular conducting loop of radius 5.0 cm. The current required to be flown in the loop is nearly:

The earth's magnetic field at a given point is 0.5 × 10-5 Wbm-2. Thi

1.	The earth's magnetic field at a given point is 0.5 × 10-5 Wbm-2. This field is to be annulled by magnetic induction at the centre of a circular conducting loop of radius 5.0 cm. The current required to be flown in the loop is nearly:
A.	0.2 A
B.	0.4 A
C.	4 A
D.	40 A
Answer» C. 4 A