Question

1 of 15

When a field is parallel to a plane of area, the magnetic flux through the coil is

A	zero.
B	infinite.
C	2.
D	5.

Question

2 of 15

A moving charge experiences magnetic forces because of a

A	magnetic flux.
B	magnetic field.
C	magnetic current.
D	both a and b.

Question

3 of 15

Total number of magnetic field lines passing through an area is called

A	magnetic flux density.
B	magnetic flux.
C	emf.
D	voltage.

Question

4 of 15

An electronic device that acts as a "one way valve" to allow electrons to flow in one direction only is referred to as a

A	transformer.
B	battery.
C	resistor.
D	diode.

Question

5 of 15

Which force field can accelerate an electron but never change its speed?

A	Magnetic field
B	Electric field
C	Gravitational field
D	All of these

Question

6 of 15

Three 10 ohm resistors are connected in series to a 12 V battery. The power dissipated by each resistor in the circuit is

A	120 watts.
B	1.6 watts.
C	14.4 watts.
D	4.8 watts.

Question

7 of 15

Three 10 ohm resistors are connected in series to a 12 V battery. The total current in the circuit is

A	0.4 amps.
B	120 amps.
C	0.455 amps.
D	3.6 amps.

Question

8 of 15

By accelerating the magnet inside a coil, the current in it

A	increases.
B	decreases.
C	remains constant.
D	reverses.

Question

9 of 15

Induced current in a coil by a magnet turns it into an

A	straight wire.
B	magnet.
C	ammeter.
S	electromagnet.

Question

10 of 15

An induced current depends upon the speed with which a conductor moves and the

A	resistance of the galvanometer.
B	voltage of the loop.
C	current of the loop.
D	resistance of the loop.

Question

11 of 15

An alternative current generator is based upon

A	Ampere's law.
B	Lenz's law.
C	Faraday's law.
D	Coulomb's law.

Question

12 of 15

You can touch a 100,000-volt Van de Graaff generator with little chance of harm because although the voltage is high, the small amount of charge means there is a relatively small amount of

A	polarization.
B	conduction.
C	electric field.
D	energy.

Question

13 of 15

A device that converts electrical energy into mechanical energy is a(an)

A	AC generator.
B	DC generator.
C	cell.
D	DC motor.

Question

14 of 15

Currents that flow in circles inside a disc are known as

A	eddy currents.
B	circular currents.
C	air currents.
D	alternating currents.

Question

15 of 15

In a transformer, the core is made up of soft iron in order to pass maximum

A	flux.
B	current.
C	magnetic flux.
D	voltage.

Answer 1

1] A , when field is parallel to the plane, its area vector is perpendicular to the field and flux is B.A

2] B, magnetic force = qvB

3] A, magnetic flux density is number of magnetic field lines passing through an area

4] D, a diode allows current to flow only in one direction.