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\times {{10}^{-4}}C $ flows into the coil. If the resistance of the coil is $ 80\Omega $ , the magnetic flux density in $ Wb/m^{2} $ is [MP PET 2005]

Options:

A) 0.5

B) 1.0

C) 1.5

D) 2.0

Show Answer

Answer:

Correct Answer: B

Solution:

$ \Delta Q=\frac{\Delta \varphi }{R}=\frac{n\times BA}{R} $

Þ $ B=\frac{\Delta Q.R}{nA} $ $ =\frac{2\times {{10}^{-4}}\times 80}{40\times 4\times {{10}^{-4}}} $ $ =1\ Wb/m^{2} $



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