Why is a spark produced in the switch of a fan when it is put off?

Why is plasma produced in stars ?

Water enters into a cell when it is put into:

A transistor can be used as a switch by operating it in its cut off state or saturation state. (Yes/No)

Given instructions same as in chapter 1. Assertion:In Hertz experiment, the electric vector of radiation produced by a source gap is parallel to the gap. Reason:Production of sparks between the detector gap is maximum when it is perpendicular to the source gap.

In E.coli, the lac operon gets switched on when :

Which one of the following parts of the plant when put into the soil is likely to produce new offspring?

A circuit is connected as shown in the figure with the switch S open. When the switch is closed, the total amount of charge that flows from Y to X is