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The earth's magnetic field at a given point is $0 .5 \times 10^{- 5} Wb / m^{2} .$ 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

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0.2 A

0.4 A

4 A

40 A

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detailed solution

Correct option is B

Magnetic field at the centre of circular loop B = μ04π2πir=B ⇒10-7×2×3.14×i.05 =0.5×10-5 ⇒i =0.4 A

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The earth's magnetic field at a given point is 0.5× 10−5 Wb/m2. 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

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

The earth's magnetic field at a given point is $0 .5 \times 10^{- 5} Wb / m^{2} .$ 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