Why does the electric fan continue to rotate for some time after the current is switched off ?

A fan makes 2400 rpm. If after it is switched off, it comes to rest in 10 s, then find the number of times it will rotate before it comes to rest after it is switched off.

Why does a football come to a stop after rolling for some time?

Why electrochemical cell stops working after some time?

Why does the lac operon shut down some time after the addition of lactose in the medium where E.coli was growing ? Why low level expression of lac operon is always required ?

Why does the cord of an electric heater not glow while the heating element does ?

A current of 500 mA ſlows in the coil of the previous problem. When the current is switched off it vanishes after a time of 10^(-4) s. Supposing the current to decrease linearly, find the e.m.f. of self-induction

An inductor of 10mH is connected to a 18V battery through a resistor of 10k Omega and a switch After a long time, when the maximum current is set up in the circuit, the current is switched off. Calculate the cur- rent in the circuit after 2 mu s.

A current i_(0) is flowing through an L-R circuit of time constant t_(0) . The source of the current is switched off at time t = 0 . Let r be the value of (-di//dt) at time t = 0 .Assuming this rate to be constant, the current will reduce to zero in a time interval of

The magnetic field midway between two parallel current carrying wires, carrying currents I and 2i in same direction is B. If the current in the wire with current I is switched off, the magnetic field will become

Why and how does water enter continuously into the root xylem ?