Electromagnetic Induction and Alternating Current 1 Question 2

2. A 10m long horizontal wire extends from North-East to South-West. It is falling with a speed of 5.0ms1 at right angles to the horizontal component of the earth’s magnetic field of 0.3×104Wb/m2. The value of the induced emf in wire is

(a) 1.5×103V

(b) 1.1×103V

(c) 0.3×103V

(d) 2.5×103V

(Main 2019, 12 Jan II)

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Answer:

Correct Answer: 2. (a)

Solution:

  1. Wire falls perpendicularly to horizontal component of earth’s magnetic field, so induced electromotive force (ε) =Blv

Substituting the given values, we get

ε=0.3×104×10×5=1.5×103V



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