Electro Magnetic Induction And Alternating Currents Question 508

Question: In a coil of resistance 100 Q, a current is induced by changing the magnetic flux through it as . The magnitude of change in flux through the coil is

Options:

A) 250 Wb

B) 275 Wb

C) 200 Wb

D) 225 Wb

Show Answer

Answer:

Correct Answer: A

Solution:

  • According to Faraday’s law of electromagnetic induction,

    ε=dϕdt Also, ε=iR
    iR=dϕdtdϕ=Ridt

    Magnitude of change in flux (dϕ)=R×area under current vs time graph or

    dϕ=100×12×12×10=250,Wb



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