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The mutual inductance of a pair of coils is 2 H. If the current in one of the coils changes from 10 A to zero in 0.1 s, the emf induced in the other coil is

Correct answer: D. 200 V

  • A. 2 V
  • B. 0.2 V
  • C. 20 V
  • D. 200 V

Explanation

D is the correct answer.The emf (E) induced in a coil is given by E=−M⋅ΔI/Δt , where M is the mutual inductance, ΔI is the change in current, and Δt is the change in time. Substituting the given values, we get E=−2⋅10/0.1 =−200 V. The negative sign indicates the direction of the induced emf.

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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.

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