EASY
12th West Bengal Board
IMPORTANT
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What is meant by radial magnetic field? Explain why such a field is necessary for a moving coil galvanometer. How it is produced in the galvanometer?

Important Questions on Electromagnetism

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 1
A circular coil of radius 10 cm has 250 turns. Find the magnetic field at its centre if the coil carries a current of 20 mA.
 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 1
A circular coil of radius 10 cm has 250 turns. Find the magnetic field at a point 20 cm away from its centre on the axis of the coil, if the coil carries a current of 20 mA.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 2
Two long parallel straight wires X and Y Separated by a distance 5 cm in air carrying currents of 10 A and 5 A respectively in opposite direction. Calculate the magnitude and direction of the force on 20 cm length of the wire Y.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 3
A straight wire of length π2 metre, is bent into a circular shape. If the wire was to carry a current of 5 A, Calculate the magnetic field, due to it, before bending, at a point distance 0.01 times the radius of the circle formed from it. Also calculate the magnetic field at centre of the circular loop formed, for the same value of the current.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 4
A semi-circular arc of radius 20 cm carries a current of 10 A. Calculate the magnitude of the magnetic field at the centre of the arc.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 5
A straight wire carries a current of 3 A. Calculate the magnitude of the magnetic field at a point 15 cm away from the wire. 
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 6
Calculate the magnetic field at the centre of coil in the form of square of side 4 a carrying current I. 
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 8 - Electromagnetism>EXERCISE 8>Q 7

As shown in Fig. a cell is connected across X and Y of a uniform circular conductor. Prove that the magnetic field at the centre will be zero.

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