Magnetic Effects of Electric Current

Q. According to Oersted's experiment, the deflection in the compass needle takes place only when the switch is off.

1. True

2. False

Q.

What happens to the needle of a compass kept nearby when electric current is switched on in a wire? Why does this happen?

Q.

Question 2
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?

Q. What happens if you place a compass near a current carrying wire?

1. The needle in the compass gets charged.
2. The needle in the compass becomes hot.
3. The needle in the compass glows brightly.
4. The needle in the compass gets deflected.

Q.

Question 6
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Q. Question 4

When the electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

(a) the chemical effect of current.
(b) the heating effect of current.
(c) the magnetic effect of current.
(d) the lightning effect of current.

Q. Why do needle of a magnetic compass show deflection when kept near an electric circuit?

Q.

Question 10

Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons?

Q. Question 12
In the circuit shown in Fig, when the key is closed, the compass needle placed in the matchbox deflects. Name the force which causes this deflection.

Q.

When free ends of conductivity tester are dipped into a solution the magnetic needle shows deflection?explain

Q.

Assertion (A): A magnet loses its magnetism when heated.

Reason (R): When heated, the molecules gain thermal energy, and the kinetic energy increases. This results in the breaking of a straight line molecular chain.

1. A and R are true and R is the correct explanation of A.

2. A and R are true, but R is not the correct explanation of A.

3. A is true but R is false.

4. Both A and R are false.

Q.

Donald Duck conducted experiment to test the conductivity of two liquids A and B by using the tester with magnetic needle. Current is passed through both the liquids and it is found that magnetic needle deflected more in case of Liquid B. Which among these liquids is a poor conductor and why?

Q.

Question 2
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?

Q. Ram collected some rainwater as his teacher told him that rainwater is equivalent to distilled water. He randomly tested the rainwater to confirm wheather his teacher is right or not. He observe something in the magnetic compass.Can you state the reason for the deflection of the compass?

Q.

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

1. The needle of the compass gets deflected

2. The needle of the compass glows brightly.

3. The needle of the compass becomes hot.

4. The needle of the compass gets charged.

Q.

Donald Duck conducted an experiment to test the conductivity of two liquids A and B by using a tester with magnetic needle. Current was passed through both the liquids and it was found that the magnetic needle deflected more in case of Liquid B. Which among these is a poorer conductor and why? [2 MARKS]

Q. Identify the liquids that will cause deflection in the magnetic compass when connected in an electric circuit.

1. Honey
2. Vinegar
3. Milk
4. Lemon juice
5. Sulphuric acid
6. Distilled water
7. Mercury
8. Vegetable oil
9. Tap water

Q. solenoid can be used for making permanent magnets.explain, how this is done.

Q. When the S-pole of a magnet is placed near an unknown pole of another magnet, the two magnets

1. Attract each other because the unknown pole is a N - pole
2. Repel each other because the unknown pole is a S - pole
3. Attract each other because the unknown pole is a S - pole
4. Can either attract or repel.