Question

In the capacitance is halved, with no other change and . The effective current through the source is

Answer 1

Answer:

A current I flows through a circular coil of one turn of radius R in the counter-clockwise

direction.

1. The magnetic field at the centre is inversely proportional to R.

2. The magnetic moment of the coil is directly proportional to R2

.

3. The magnetic field at its centre is directly proportional to R2

.

Which of the above statements is/are correct?

(A) 1 and 2 (B) 1 only (C) 2 and 3 (D) 3 only

Key: (A)

Exp:

I 1 H , H

2 R R

 



Magnetic moment (m) is given as

2 m I R a   n

2 m R 

Answer 2

Answer:

The property of a capacitor to store charge on its plates in the form of an electrostatic field is called the Capacitance of the capacitor. Not only that, but capacitance is also the property of a capacitor which resists the change of voltage across it.