1. If a charged particle moves through a magnetic field perpendicular to it ? momentum is constant but energy changes. energy is constant but momentum changes. momentum as well as energy are constant. both momentum and energy of particle change. Answer: energy is constant but momentum changes. Explanation: Since the direction of velocity of a particle varies so momentum changes but direction of magnetic force is always perpendicular to direction of charged particle. So no work is done, i.e. energy remains the same. View Answer Discuss in Forum Report Question

 2. A strong magnetic field is applied on a stationary electron. Then the electron ? moves opposite to the direction of the field. moves perpendicular to the direction of the field. remained stationary. moves in the direction of the field. Answer: remained stationary. Explanation: View Answer Discuss in Forum Report Question

 3. The nature of parallel and anti-parallel currents are ? parallel currents attract and antiparallel currents repel. both currents repel. parallel currents repel and antiparallel currents attract. both currents attract. Answer: parallel currents attract and antiparallel currents repel. Explanation: View Answer Discuss in Forum Report Question

 4. Energy in a current carrying coil is stored in the form of ? heat electric field magnetic field dielectric strength Answer: magnetic field Explanation: View Answer Discuss in Forum Report Question

 5. To make the field radial in a moving coil galvanometer ? coil is wounded on aluminium frame poles are cylindrically cut magnet is taken in the form of horse-shoe the number of turns in the coil is increased Answer: poles are cylindrically cut Explanation: View Answer Discuss in Forum Report Question

 6. The AC voltage across a resistance can be measured using a ? moving magnet galvanometer potential coil galvanometer hot wire voltmeter moving coil galvanometer Answer: moving coil galvanometer Explanation: View Answer Discuss in Forum Report Question

 7. In cyclotron the gyro radius is ? inversely proportional to energy proportional to momentum proportional to energy inversely proportional to momentum Answer: proportional to momentum Explanation: View Answer Discuss in Forum Report Question

 8. If a current is passed through a spring then the spring will ? remains same expand compress None of these Answer: compress Explanation: View Answer Discuss in Forum Report Question

 9. A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon ? value of current magnetic field area of loop None of these Answer: None of these Explanation: View Answer Discuss in Forum Report Question

 10. A charged particle moving in a uniform magnetic field and losses 4% of its kinetic energy. The radius of curvature of its path changes by ? 12% 4% 2% 10% Answer: 10% Explanation: View Answer Discuss in Forum Report Question