Example 12.11: The mutual inductance (M) of the two coils is given as 1.5 H. The self inductances of the coils are : L1= 5 H, L2 = 4 H. Find the coefficient of coupling between the coils.

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

If a body is executing simple harmonic motion then

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