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Class 12 Physics (Part I) Chapter 4 Moving Charges And Magnetism Quiz 7 (20 MCQs)

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1. Magnetic field lines can sometimes cross.
2. An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true? (a) The electron will be accelerated along the axis. (b) The electron path will be circular about the axis. (c) The electron will experience a force at 45$^\circ$ to the axis and hence execute a helical path. (d) The electron will continue to move with uniform velocity along the axis of the solenoid.
3. A wire is kept along north-south direction and a constant current is flowing in it in north to south direction. What will be the direction of the force on the wire if it is placed in constant magnetic field along west to east direction:
4. An ammeter gives full scale deflection when current of 1.0 A is passed in it. It is converted into a 100 A range ammeter, What will be the ratio of the shunt resistance and its resistance?
5. Most elements that are magnetic are .....
6. What is the direction of the magnetic field around a straight current-carrying conductor?
7. This is magnetism produced by electric currents or the interaction of electric and magnetic fields.
8. In Fleming's left hand rule, middle finger is used to show the direction of .....
9. To convert a moving coil galvanometer into on ammeter of given range, we must connect:
10. The ratio of voltage sensitivity ( $V_s$ $I_s$
11. If in a moving coil galvanometer, a current I in its coil produces a deflection $\theta$
12. Current sensitivity of a galvanometer is given by
13. What happens to the magnetic field strength if the current through a solenoid is doubled?
14. Assertion (A):An atom behaves as magnetic dipole.Reason (R):It is because, an atom contains equal positive & negative charges.
15. 1 Gauss =
16. The direction of the force experienced by a charged particle entering perpendicular to the magnetic field?
17. In an experiment, a current-carrying wire is placed in a magnetic field. What happens to the wire?
18. An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be
19. A charged particle moves through a magnetic field in a direction perpendicualr to it. Then the
20. Electric current flows through a wire.Magnetic field on its surfacce
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