Question

a circular coil is made from a wire 1m in length. When a current pi ampere passes through it, its magnetic moment is-​

Answer 1

Answer:

cectvunnikitvxwtvbimuxecymp

Answer 2

Given:

length of wire l = 1 m

current I = π A

To find:

magnetic moment m =?

Step-to-step-explanation:

• A circular coil is made from a wire of 1m in length.

• The magnetic moment of a circular coil is given as:

         m = nIA

         where

         m = magnetic moment

         n = number of turns in a circular coil

         I = current flowing in the coil

        A = area of a circular coil

• We have to find the magnetic moment of a circular coil when π A current is passing through it.  

        ∴ I = π A

• Consider a circular coil of 1m in length that has only one turn.

        i.e. n = 1

• Put the value of current in the above equation o find the magnetic moment.

        m = 1 × (π) × A

        m = πA m²

• The magnetic moment of a circular coil when π A current is passing through it is πA m².