Electro Magnetic Induction And Alternating Currents Question 417

Question: A horizontal ring of radius r=1/2m is kept in a vertical constant magnetic field 1 T. The ring is collapsed from maximum area to zero area in 1 s. Then the emf induced in the ring is

Options:

A) 1,V

B) (π/4),V

C) (π/2),V

D) π,V

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Answer:

Correct Answer: B

Solution:

  • |ε|=BdAdt |ε|=B(A2A1)(t2t1) |ε|=1(π40)(10) ε=π4V


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