Magnetic Effects of Electric Current

Q. What makes and breaks the circuit in an electric bell?

1. Electromagnet
2. Contact screw
3. Striker
4. Gong

Q.

Why does the needle of a magnetic compass deflect when it is kept beside a current-carrying wire?

Q.

Which of the following produces magnetic field as well as respond to external magnetic field?

1. Only magnets.

2. Magnets and current carrying wires

3. Only current carrying wires.

4. none of these

Q.

Which of the following devices use electromagnets?

1. Washing machine

2. Bulb

3. Electric bell

4. Electric heater

Q. The magnetic field of an electromagnet may be hundreds of times stronger than the magnetic field of just the solenoid. Explain, why ?

Q.

_________is the pattern of magnetic field around a straight current carrying conductor.

1. Parallel lines

2. Emerging in all direction from the conductor

3. Concentric circles

4. Similar to pattern found in bar magnet

Q.

Which of the following is true about current carrying conductors?

1. They behave as magnet when current do not flows through them

2. They behave as magnet when current flows through them

3. They can never behave as magnet

4. None of the above

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

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

Q.

When we bring a magnetic needle near a current carrying conductor, it gets deflected. This deflection is an example of:

1. None of these

2. Chemical effect of electric current

3. Heating effect of electric current

4. Magnetic effect of electric current

Q.

Select the correct option:

I) A magnetic needle responds to the Earth’s magnetic field.

II) A magnetic needle gets deflected when a magnet is brought near it.

III) A magnetic needle is made up of a non-magnetic material.

1. I and II are correct

2. only I is correct

3. I and III are correct

4. only II is correct

Q.

On which of the following factor, the direction of deflection of a magnetic needle of a compass depends when the compass is kept near a current carrying wire?

1. Direction of current flowing through the circuit

2. Magnitude of current flowing through the circuit

3. Size of Magnetic Needle

4. Both A and B

Q. Who among the following discovered the magnetic effect of electric current?

1. Oersted
2. Maxwell
3. Henry
4. Albert Einstein

Q.

What happens if you place a compass near a current conducting wire?

1. The needle in the compass gets deflected

2. The needle in the compass glows brightly.

3. The needle in the compass gets charged.

4. The needle in the compass becomes hot.

Q.

Electric bell is an example of a/an

1. Bar magnet

2. Electromagnet

3. Horseshoe magnet

4. Cylindrical magnet

Q. State two ways through which the strength of an electromagnet can be increased.

Q.

The magnetic effect of electric current was first observed by _____________.

1. H.C. Oersted

2. Isaac Newton

3. Galileo Galilei

4. W.H. Whitkar

Q. A fuse works on the principle of _______ effect of electric current.

1. relative
2. sound
3. heating
4. magnetic

Q. Define magnetic effect of electric current.