Electro Magnetic Induction And Alternating Currents Question 403

Question: If a coil of 40 turns and area 4.0 cm2 is suddenly removed from a magnetic field, it is observed that a charge of 2.0×104C flows into the coil. If the resistance of the coil is 80Ω , the magnetic flux density in Wb/m2 is [MP PET 2005]

Options:

A) 0.5

B) 1.0

C) 1.5

D) 2.0

Show Answer

Answer:

Correct Answer: B

Solution:

ΔQ=ΔφR=n×BAR

Þ B=ΔQ.RnA =2×104×8040×4×104 =1 Wb/m2



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