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Olympiad workbookNSEPMagnetic Properties of Matter

The earth's magnetic field at a certain point is 7.0 10⁻⁵ ~T . This field is to be balanced by a magnetic field at the centre of a circular current carrying coil of radius 5.0 cm by suitably orienting it. If the coil has 100 turns then the required current is about

Options

  1. A28 mA
  2. B56 mA
  3. C100 mA
  4. D560 mA

Correct answer

B. 56 mA

Step-by-step solution

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