1
Question
The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength 4× 10−4 Wb/m2, if rotated through 90∘ in 0.1 sec, the average emf induced in the coil is
The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength 4× 10−4 Wb/m2, if rotated through 90∘ in 0.1 sec, the average emf induced in the coil is
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Solution
The correct option is C 0.2 V
From Faraday's law of induction,
E=−△ ϕ△ t
E=−NBA(cosθ2−cosθ1)△ t
E=−500× 4× 10−4× 0.1(cos90∘−cos0∘)0.1
E=0.2 V
Therefore, option (D) is correct.
From Faraday's law of induction,
E=−△ ϕ△ t
E=−NBA(cosθ2−cosθ1)△ t
E=−500× 4× 10−4× 0.1(cos90∘−cos0∘)0.1
E=0.2 V
Therefore, option (D) is correct.
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