Question

why emf is opposite to current in an inductor?​

Answer 1

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This collapsing magnetic field now returns its energy into the inductor coil and induces a voltage (a back EMF) into the inductor, but because the change in magnetic field strenth is in the opposite direction to the expanding field at switch on, the induced voltage is now in the opposite polarity

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$\huge \underline \red {\sf{Extra \ information :}}$

The current cannot change instantaneously in an inductor because for this to occur, the current would need to change by a finite amount in zero time which would result in the rate of current change being infinite, di/dt = ∞, making the induced emf infinite as well and infinite voltages do no exist.

Answer 2

Explanation:

thethe diagram showing all the force act on an object at their practical in start is called free body diagram know as FB example a car is moving with a uniform speed along a road