First slide
Inductance
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

Moderate
Solution

B=μ0Ni2r=4π×107×100×2×π2×102=0.022wb/m2

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