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# Question 14: NCERT Solutions for 12th Class Physics: Chapter 4-Moving Charges and Magnetism

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Question 14: NCERT Solutions for 12th Class Physics: Chapter 4-Moving Charges and Magnetism

Two concentric circular coils X and Y of radii 16 cm and 10 cm, respectively, lie in the same vertical plane containing the north to south direction. Coil X has 20 turns and carries a current of 16 A; coil Y has 25 turns and carries a current of 18 A. The sense of the current in X is anticlockwise, and clockwise in Y, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their centre.

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### 1 Answer

1. Solution:
The concentric coils are in the plane north to south. Let us decide the directions with conveniences in the plane of paper.

Magnetic field at centre due to coil X

So, a magnetic field nearly 1.6 × 10-3 T will appear at centre of the circular coil directed towards west.

Check the complete chapter with solutions.

NCERT Solutions for 12th Class Physics: Chapter 4-Moving Charges and Magnetism