Electric Charges and Fields — Physics STD 12 Science — Question

The simplest type of AC voltage or current is the one which.

Assertion  :   An aircraft flies along the meridian, the potential at the ends of its wings will be the same.

Reason     : Whenever there is change in the magnetic flux e.m.f. induces.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

The maximum current that flows through a fuse wire before it blows out varies with its radius as

(a)

(b) r

(c)

(d)

Which of the following statements related to static electricity is not true?

In an NPN transistor the collector current is 24 mA. If 80% of electrons reach collector its base current in mA is

(a) 36

(b) 26

(c) 16

(d) 6

What is the equivalent resistance between the points A and B of the network

(a)

(b) 8 W

(c) 6 W

(d)

In case of a Van de Graaff generator, the breakdown field of air is:

For nuclei with A > 100:

NOR gate is the series combination of:

A potentiometer can measure emf of a cell because: