Electro Magnetic Induction And Alternating Currents Question 478

Question: A rectangular coil of 20 turns and area of cross- section 25 sq. cm has a resistance of $ 100,\Omega $ . If a magnetic field which is perpendicular to the plane of coil changes at a rate of 1000 tesla per second, the current in the coil is

Options:

A) 1 A

B) 50 A

C) 0.5 A

D) 5 A

Show Answer

Answer:

Correct Answer: C

Solution:

  • $ i=\frac{e}{R}=\frac{\frac{nAdB}{dt}}{R} $ $ =\frac{20\times (25\times {{10}^{-4}})\times 1000}{100}=0.5A $


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