Electro Magnetic Induction And Alternating Currents Question 379

Question: A coil of 40 W resistance has 100 turns and radius 6 mm is connected to ammeter of resistance of 160 ohms. Coil is placed perpendicular to the magnetic field. When coil is taken out of the field, 32 m C charge flows through it. The intensity of magnetic field will be [RPET 1997]

Options:

A) 6.55 T

B) 5.66 T

C) 0.655 T

D) 0.566 T

Show Answer

Answer:

Correct Answer: D

Solution:

q=NR(B2B1)Acosθ 32×106 =100(160+40)(0B)×π×(6×103)2×cos0o
B=0.565 T



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