2025 Exam Questions
Q. What is the work done by an external uniform magnetic field perpendicular to the velocity of a moving charge?
Q. State the formula for magnetic induction produced by a current in a circular arc of a wire. Hence find the magnetic induction at the centre of a current carrying circular loop.
Q. A solenoid of length \pi \mathrm{m} and 5 cm in diameter has a winding of 1000 turns and carries a current of 5A. Calculate the magnetic filed at its centre along the axis.
2024 Exam Questions
Q. Write the formula for torque acting on rotating current carrying coil in terms of magnetic dipole moment, in vector form.
Q. Explain Biot-Savart law.
Q. A circular coil of wire is made up of 200 turns, each of radius 10 cm. If a current 0f 0.5 A passes through it, what will be the magnetic field at the centre of the coil?
Q. A current carrying toroid winding is internally field with lithium having susceptibility x=2.1\times10^{-5}. What is the percentage increase in the magnetic field in the presence of lithium over that without it?
2023 Exam Questions
Q. What is the value of force on a closed circuit in a magnetic field?
Q. Obtain an expression for magnetic induction of a toroid of ‘N’ turns about an axis passing through its centre and perpendicular to its plane.
Q. Calculate the current flowing through two long parallel wires carrying equal currents and separated by a distance of 1.35 cm experiencing a force per unit length of 4.76 x 10-2 N/m.
2022 Exam Questions
Q. The unit Wbm-2 is equal to _____.
(A) henry
(B) watt
(C) dyne
(D) tesla
Q. The magnitude of the megnetic field at the centre of a circular current carrying coil varies ____.
(A) inversely with the square of the radius of the coil
(B) directly with the radius of the coil
(C) inversely with the radius of the coil
(D) directly with the square of the radius of the coil
Q. Draw a neat and labelled diagram of suspended coil type moving coil galvanometer.
Q. Calculate the value of magnetic field at a distance of 3 cm from a very long, straight wire carrying a current of 6 A.
Q. A current of equal magnitude flows through two long parallel wires separated by 2 cm. If force per unit length of 4 x 10-2 N/m acts on both the wires respectively, calculate the current through each wire.
