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Q.

The Earth’s magnetic field at a given point is 0.5 G. This field is to be annulled by magnetic induction at the centre of a circular coil of radius 5 cm. The current required to be flown in the loop is nearly

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answer is 3.

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Detailed Solution

B=μ0i2r⇒i=2Brμ0i=2×0.5×10−4×5×10−24×3.14×10−7=4A
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The Earth’s magnetic field at a given point is 0.5 G. This field is to be annulled by magnetic induction at the centre of a circular coil of radius 5 cm. The current required to be flown in the loop is nearly