Oersted's Experiment

Q.

Describe some experiment to show that the magnetic field is associated with an electric current.

Q.

Name the scientist who discovered the magnetic effect of current.

Q. Who discovered the relation between electricity and magnetism?

1. Faraday
2. Maxwell
3. Newton
4. Oersted

Q. A magnetic compass needle is placed on the plane of paper near point A in which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the the deflection of the magnetic compass. When is the deflection maximum?
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Q. A bar magnet is divided in two pieces. Which of the following statements is/are true in that case?

1. The magnetic field of each separated piece becomes stronger
2. The two parts will have N and S pole.
3. Two new bar magnets are created
4. The bar magnet is demagnetized

Q.

Why does a magnetic compass shows different deflection of its needle when put below and above the wire of a circuit????

Q.

What happens to the deflection of a compass needle placed at a point near the current-carrying straight conductor if

1. The current is increased
2. The direction of the current is reversed
3. The compass is moved away from the conductor?

Q.

The presence of magnetic field at a point can be detected by means of:

(a) a strong magnet

(b) a solenoid

(c) a compass needle

(d) a current carrying wire.

Q.

While detecting the magnetic field around a bar magnet, how do iron filings arrange themselves?

Q. 43.The position of point from wire B where net magnetic filed is zero due to following current distribution is :(b)

Q.

Descirbe how you will locate a current-carrying wire concealed in a wall.

Q. Distinguish between alternating current and induced current(3 mark)

Q.

By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.

Q. How to demagnetize a magnet?

Q.

Two factors on which the strength of an induced current depends are:

1. Magnitude of magnetic flux linked with the coil and material of the coil

2. Magnitude of magnetic flux linked with the coil and number of turns in the coil

3. Rate of change of magnetic flux linked with the coil and material of the coil

4. Rate of change of magnetic flux linked with the coil and number of turns in the coil

Q. Which of the following is/are true in case of magnetic needle placed below current carrying conductor?

1. For an electric current from South to North, the compass needle gets deflected towards West direction.
2. For an electric current from South to North, the compass needle gets deflected towards East direction.
3. For an electric current from North to South, the compass needle gets deflected towards East direction.
4. There will not be any deflection in the needle.

Q.

Question 9
A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in figure. The direction of magnetic field at a point will be north to south

(a) directly above the wire
(b) directly below the wire
(c) at a point located in the plane of the paper, on the north side of the wire
(d) at a point located in the plane of the paper, on the south side of the wire

Q.

What conclusion do you get from the observation that a current-carrying wire deflects a compass placed near it ?

Q. Magnetic field is produced by current carrying conductor. This phenomenon was discovered by____.

1. Faraday
2. Maxwell
3. Coulomb
4. Oersted

Q.

Which effect of current can be utilized in detecting a current carrying wire concealed in a wall?

Q.

A compass needle is placed below a wire and a current is made to flow through the wire. The needle will

1. Deflect as a magnetic field is produced around the current-carrying conductor

2. Deflect due to Earth’s magnetic field

3. Point along North –South due to Earth’s magnetic field

4. None of the above

Q.

What happens to the magnetic needle if it is placed near an electric current ?

Q.

Electromagnets gain or lose their magnetic properties based on the supply of the electrical current.

1. True

2. False

Q.

Which of the following is necessary for a force to act between two objects?

1. Objects must touch each other.
2. Objects must not touch each other.
3. Objects must interact with each other.
4. Objects must be close to each other.

Q. Who discovered the relation between electricity and magnetism?

1. Faraday
2. Newton
3. Maxwell
4. Oersted

Q. Who is the father of electrodynamics?

Q.

In an electric method of magnetization, a direct current is used.

1. True
2. False

Q. Is there any other metal except soft iron which can be used to make electromagnet?

Q. Cyclotron frequency does not depend on 1. Radius 2. Velocity 3. Magnetic induction 4. None

Q. Which law relates the change in the magnetic flux and the electric current in a coil?

1. Volta's
2. Maxwell's
3. Fleming's
4. Faraday's