CBSE Class 12 Physics Magnetic Effects of Electric Current Solved Examples

CBSE Class 12 Physics Magnetic Effects of Electric Current Solved Examples. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

Ex.1 A current of one ampere is flowing along the sides of an equilateral triangle of side 4.5 × 10–2 m. Find the magnetic field at the centroid of the triangle.

Ex.2 The centres of two similar coils P and Q having same number of turns are located at coordinates (0.4, 0) m and (0, 0.3) m such that the plane of coils are perpendicular to X and Y axes respectively. The areas of cross sections of coils P and Q are in the ratio 4 : 3. The coil P has 16 A current in clockwise direction and the coil Q has 9 3 A current in anticlockwise direction as seen from the origin. A small compass needle is placed at the origin. Find the deflection of the needle assuming the earth’s magnetic field negligible and the radii of the coils very small as compared to their distances from the origin. (Take radius of ring is small)

Ex.3. A solenoid of length 0.4 m and diameter 0.6 m consists of a single layer of 1000 turns of fine wire carrying a current of 5.0 milliampere. Find the magnetic field on the axis at the middle and at the ends of a solenoid.
Sol. The magnetic field B inside a current carrying solenoid at any point O lying on the axis is given by

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