Get, detailed solutions to the questions of the chapter **Moving Charges and Magnetism** from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme. **Cbse.jagranjosh.com** provided you NCERT solutions for classes 12th math and science subjects.

Some questions of this chapter are given here.

**Q.** A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

**Sol.**

Given:

N = 100

R = 8cm

I = 0.4 A

By the formula

Substitution yields

B = 3.1x10^{-4} T

**Q.** A long straight wire carries a current of 35 A. What is the magnitudeof the field B at a point 20 cm from the wire?

**Sol.**

Given:

I = 35 A

x = 20 cm

Let us consider an Amperian loop of radius equal to x, i.e. 20 cm

Therefore by formula,

Solving for B

B = 3.5x10^{-5} T

**Q.** A long straight wire in the horizontal plane carries a current of 50 Ain north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

**Sol.**

Given:

I = 50 A

R = 2.5 m

Using the above formula

B = 4x10^{-6} T

Direction is vertical up.

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