Application of Magnetic Effect of Electricity

Q.

Which sources produce alternating current?

Q. When a current carrying conductor moves in a magnetic field in a direction different from that of the field, it experiences a force called the .

1. normal force
2. frictional force
3. lorentz force

Q. Choose the device that works on the principle of magnetic effects of electric current.

1. Iron box
2. Wind turbine
3. Lever
4. Loudspeakers

Q. Electromagnets are magnets.

1. temporary
2. bar
3. permanent
4. ring

Q. Sort the magnetic strength of electromagnet in ascending order from top to bottom when current is varying.

1. Current = 1 A
2. Current = 3 A
3. Current = 6 A
4. Current = 8 A
5. Current = 12 A

Q. The force experienced by the magnet is due to the magnetic field of the current carrying conductor.

1. False
2. True

Q. An electric bell has all the following parts except _____.

1. striker
2. contact screw
3. gong
4. graphite rod

Q. Fuse wire must have melting point than the circuit wire.

1. lower
2. equitable
3. higher

Q.

Which of the following are the sources of direct current?

1. DC generator

2. Batteries

3. Solar cells

4. AC generator

Q.

Select the correct option:

1. A - Striker, B - Contact Screw, C - Electromagnet, D - Gong

2. A - Gong, B - Contact Screw, C - Electromagnet, D - Striker

3. A - Striker, B - Electromagnet, C - Contact Screw, D - Gong

4. A - Striker, B - Gong, C - Contact Screw, D - Electromagnet

Q. Study the statements given below:
(i) Electromagnets can be made more powerful than ordinary bar magnets.
(ii) Soft iron is easy to magnetize and demagnetize.
(iii) The poles of an electromagnet are not affected by the direction of the current.
Which of the above statements are correct?

1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. (i), (ii) and (iii)