 # Class 10 Magnetic effects of current - Practice Worksheet

## One marks questions

Question 1
How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire increases?

Question 2
What is the advantage of the third wire of earth connection in domestic appliances?

Question 3
How is the strength of the magnetic field at a point near a wire related to the strength of the electric current flowing in the wire?

Question 4
On what effect of an electric current does an electromagnet work?

## Two marks questions

Question 5
Explain terms:
(b) short-circuiting

Question 6
Explain the function of earth wire. Why is it necessary to earth metallic appliances?
Question 7
All household appliances are connected in parallel. List two advantages of this type of arrangement.

Question 8
What is a solenoid?

Question 9
What kind of magnetic field is produced by a current carrying solenoid?

Question 10
Why does a compass needle show deflection when brought near a bar magnet?

Question 11
Why are magnetic field lines more crowded towards the pole of a magnet?

Question 12
What are magnetic field lines?
Question 13
Draw a diagram to represent a uniform magnetic field in a given region.
Question 14
For same current flowing through a solenoid and a straight conductor, the magnetic field produced by a solenoid is much stronger than the magnetic field produced by a straight current carrying conductor. State one reason to justify this statement.
Question 15
Why does a current carrying conductor experience a force when it is placed in a magnetic field?

Question 16
How is the type of current that we receive in domestic circuit different from the one that runs in a clock?

Question 17
What type of current is given direct current?
Question 18
What type of current is used in household supply?

Question 19
Why do we connect earth wire in a house? Give two reasons.
Question 20
What is the difference between a direct current and an alternating current. How many times does AC used in India change direction in one second?
Question 21
What is the role of fuse used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Question 22
(a) A stationary charge is placed in a magnetic field. Will it experience force? Give reason and justify your answer.
(b) On what factors does the direction of force experienced by a current carrying conductor when placed in a magnetic field depends?
(c)Under what conditions is the force experienced by a current carrying conductor placed in a uniform magnetic field is maximum.

Question 23
List four important features of domestic electric circuit. Draw a diagram of common domestic circuit showing live, neutral and earth wires.
Question 24
What is an electromagnet?
(i) Draw a circuit diagram to show how a soft iron piece an be transformed into an electromagnet.
(ii)How can we determine north and south pole of an electromagnet with the help of magnetized iron bar?

Question 25
How will the magnetic field produced in a current carrying a circular coil change, if we increase the:
(i) Value of current flowing through it?
(ii) Distance of point P from the coil?
(iii) Number of turns of the coil?

Question 26
With the help of a diagram for experimental set up, describe an activity to demonstrate that the strength of a magnetic field at a point increases with increase in current in the straight conductor.

Question 27
How can we demonstrate the formation of magnetic field surrounding a magnet?

Question 28
Why do two magnetic field lines never intersect each other? Explain.

Question 29
Briefly explain an activity to plot the magnetic field lines produced round a straight current carrying conductor.

Question 30
How is the fuse connected in an electric circuit?

Question 31
A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it? Name the rule you have applied in this case.

Question 32
Compare the pattern of the field produced in case of a current carrying solenoid with the magnetic field of a bar magnet.

## Deleted Syllabus Questions

Question 1
(a) Name two electrical appliances of daily use in which electric motor is used.
(b) Name and state the principle on which an electric motor works.

Question 2
In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil towards the magnet, will there be any induced current? Justify your answer. Compare the two cases.
Question 3
Explain briefly two different ways to induce current in a coil. State the rule which determines direction of induced current.
Question 4
Whenever there is a relative motion between  magnet and a coil, a current is induced in the coil. Name this phenomenon.

Question 5
List in tabular form two major differences between electric motor and electric generator.

Question 6
With the help of a neat-diagram, describe how you can generate induced current in a circuit.

Question 7
State the principle of an electric generator.
Question 7  What is the function of a split ring in an electric motor?
Question 11  Draw a labelled diagram of an electric motor. Explain its principle and working.
Question 8
A coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if bar magnet is pushed into the coil and then pulled out of it. Give reason for your answer and the phenomenon involved.

Question 9
A coil of insulated wire is connected to a galvanometer. What would beseen if a bar magnet with its south pole towards one face of the coil is:
(a) Moved quickly towards it?
(b) Moved quickly away from it?
(c) Placed near its once face?
(d) Name the phenomena involved.

Question 10
(i)Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in coil B? Give reason.
(ii)With the help of diagram describe an experiment to show that a change in current flowing through a coil induces an electric current in a neighbouring coil. 