# NCERT Class 12 Physics Solutions Moving Charges And Magnetism

NCERT Class 12 Physics Solutions Moving Charges And Magnetism- NCERT Solutions prepared for CBSE students by the best teachers in Delhi.

Class XII Chapter 4– Moving Charges And Magnetism Physics

Question 4.1: 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?

Question 4.2: A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?

Question 4.3: A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

Question 4.4: A horizontal overhead power line carries a current of 90 A in east to west direction. Whatis the magnitude and direction of the magnetic field due to the current 1.5 m below the line?

Question 4.5: What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15 T?

Question 4.6: A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to itsaxis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?

Question 4.7: Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.

Question 4.8: A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its centre.

Question 4.9: A square coil of side 10 cm consists of 20 turns and carries a current of 12 A. The coil is suspended vertically and the normal to the plane of the coil makes an angle of 30º with the direction of a uniform horizontal magnetic field of magnitude 0.80 T. What is the magnitude of torque experienced by the coil?

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