1. Which instrument should, ideally, have zero resistance?
C) Voltmeter
A) Wheatstone bridge
D) Ammeter
B) Oscilloscope
2. A long conductor shown in the figure carries a current I in the direction indicated by the arrow. Which statement is not correct about the magnetic field produced by this current carrying conductor?
A) Reversing the current direction will reverse the direction of the magnetic field
B) Doubling the current through the conductor doubles the field strength
C) The field strength is directly proportional to the distance from the conductor
D) The magnetic field encircles the conductor
3. Which of the following is not true about magnetic field?
A) magnetic field lines are closed
B) magnetic monopoles exist
C) The closer the field lines are, the stronger the magnetic field
D) magnetic field is produced by moving charges
4. A square flat loop of wire is placed in a uniform magnetic field that is in the y direction. The magnetic flux through the loop is a maximum if the plane of the loop is in the
A) xy plane
B) xz plane
C) yz plane
D) inclined 45° with respect to the xy plane
5. Lentz's law in electromagnetic induction follows from which law of conservation?
A. energy
B. charge
C. momentum
D. mass
6. Which conversion process forms the basis for the function of an electric generator
A. alternating current to direct
C. electrical energy to mechanical
B. mechanical energy to electrical
D. low voltage to high voltage or vice versa
7. A step-up transformer is used to
A. Increase the power
C. Increase the voltage
B. Decrease the power
D. Decrease the voltage
8. Which device uses the principle of electromagnetic induction for its operation?
A. AC generator
B. Moving coil meter
C. Cathode ray tube
D. Light emitting diode
9. Which of the following statements is not true?
A. An electric current can be induced in a circuit with a change in cross-sectional area of the wire
B. The induced emf in the circuit is directly proportional to the time rate of change of magnetic flux
C. emf can be induced in a circuit by change in the area enclosed by the loop
D. An electric current can be induced in a circuit with a changing of magnetic field
10. Which device function with the principle of mutual inductance
A. Electromagnet
B. Transformer
C. Electric motor
D. Transistor
