Properties of Electromagnet

Q.

If the direction of current in the conductor and the magnetic field are the same, in which way will the conductor move?

1. It will not move.

2. At an acute angle with the direction of the current.

3. Perpendicular to the direction of the current.

4. In the direction of the current.

Q. A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown. The electron and the proton experience

1. Forces both pointing into the plane of paper
2. Forces both pointing out of the plane of paper
3. Forces pointing into the plane of paper and out of the plane of paper, respectively
4. Force pointing opposite and along the direction of the uniform magnetic field respectively

Q.

In certain applications, electromagnets are better than permanent magnets because:
(more than one answers can be correct)

1. Electromagnets do not require electricity.

2. The strength of the magnetic field of an electromagnet can be controlled.

3. The polarity of an electromagnet can be reversed.

4. Electromagnets can be made to act as a magnet when needed.