Electro Magnetic Induction And Alternating Currents Question 471

Question: A wooden stick of length 3 is rotated about an end with constant angular velocity ω in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is

Options:

A) 9Bω22

B) 4Bω22

C) 5Bω22

D) Bω22

Show Answer

Answer:

Correct Answer: C

Solution:

  • For A:eA=12Bω(3)2

    and eB=12B(ω)(2)2

    Resultant induced emf will be e=eA+eB=12Bω2(94)

    or e=52Bω2



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