The strength of the electromagnet can be increased by
- Areversing the directions of current
- Busing alternating current of high frequency
- ✓increasing the current in the coil
- Ddecreasing the number of turns of coil
Answer: C.
View full solution →Question types
Magnetism question types
57 questions across 6 question groups — pick any mix to generate a PHYSICS paper with step-by-step answer keys.
57
Questions
6
Question groups
5
Question types
01
MCQ
4 Q→02[1 Mark Question Answer]
10 Q→03[2 Mark Question Answer]
32 Q→04[3 Mark Question Answer]
3 Q→05[5 Mark Question Answer]
1 Q→06fill in the blanks.
7 Q→Sample Questions
Magnetism questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Electromagnets are made up of :
- Asteel
- Bcopper
- ✓soft iron
- Daluminium
Answer: C.
View full solution →In a uniform magnetic field, the field lines are:
- ACurved
- ✓Parallel equidistant straight lines
- CParallel but non-equispaced straight lines
- DNothing can be said.
Answer: B.
View full solution →Two like magnetic poles:
- ✓Repel each other
- BAttract each other
- CFirst attract each other, then repel
- DNeither nor repel.
Answer: A.
View full solution →Name one device that uses an electromagnet.
Name the material used for preparing an electromagnet.
What is an electromagnet?
Name the material used for making the armature of an electric bell. Give a reason for your answer.
Explain the meaning of the term induced magnetism.
State two ways through which the strength of an electromagnet can be increased.
Show with the aid of a diagram how a wire is wound on a U-shaped piece of soft iron in order to make it an electromagnet. Complete the circuit diagram and label the poles of the electromagnet.
A coil of insulated copper wire is wound around a piece of soft iron and current is passed in the coil from a battery. What name is given to the device so obtained? Give one use of the device mentioned by you.
Following Figure shows a coil wound around a soft iron bar XY. (a) State the polarity at the ends X and Y as the switch is pressed. (b) Suggest one way of increasing the strength of electromagnet so formed.
You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch.
- Draw a circuit diagram to represent the process.
- Label the poles of the electromagnet.
State two differences between an electromagnet and a permanent magnet.
A small magnet is suspended by a silk thread from a rigid support such that the magnet can freely swing. How will it rest? Draw a diagram to show it.
A small iron bar is kept near the north pole of a bar magnet. How does the iron bar acquire magnetism? Draw a diagram to show the polarity on the iron bar. What will happen if the magnet is removed?
Explain the method of plotting the magnetic field lines by using a small compass needle.
A freely suspended magnet rests in the geographic ___________
Like poles of a magnet ______________ each other.
Unlike poles of a magnet ___________ each other.
The two ends of a magnet are called __________.
The neutral points of a bar magnet kept with its north pole pointing towards geographic north are located ____________.
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