Electro Magnetic Induction And Alternating Currents Question 539

Question: A closely wound coil of 100 turns and area of cross-section 1 cm2 has a coefficient of self-induction 1 mH. The magnetic induction in the centre of the core of the coil when a current of 2A flows in it, will be [MP PET 1992]

Options:

A) 0.022 Wbm−2

B) 0.4 Wb m−2

C) 0.8 Wb m−2

D) 1 Wb m−2

Show Answer

Answer:

Correct Answer: A

Solution:

B=μ0Ni2r=4π×10−7×100×2×π2×10−2 =0.022 wb/m2

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