Magnetic Field Due to Current in Solenoid

Q.

A solenoid coil can be used to magnetize a soft iron core.

1. True
2. False

Q.

The strength of the magnetic field produced by a solenoid can be altered by changing the ________.

1. Direction of current

2. Magnitude of current

3. Number of turns in the coil

4. Both (B) and (c)

Q.

A closely wounded cylindrical coil whose diameter is less in comparison to its length is named as:

1. Helical magnet

2. Solenoid

3. Electro magnet

4. none of these

Q. When a soft iron core is introduced in a coil, the strength of the magnetic field:

1. Increases
2. Remains the same
3. Will become 0
4. Decreases

Q.

The magnetic field lines inside a long, current carrying solenoid are nearly _____ in shape.

1. linear

2. circular

3. parabolic

4. elliptical

Q.

How can a solenoid be used to magnetise a steel bar? [1 MARK]

Q.

What is the way to detect the polarity of a current carrying solenoid?

Q. The strength of a current carrying solenoid increases with a rise in its temperature.

1. False
2. True

Q. The strength of the magnetic field in a solenoid can be increased by increasing ________.

1. the number of coil turns per unit length
2. the electric current passing through the coil
3. the mass of the coil material
4. the density of the coil material