Field Due to a Straight Current Carrying Conductor

Q.

The magnetic field lines due to a straight wire carrying current is:

1. Straight

2. Circular

3. Parabolic

4. Elliptical

Q.

The direction of magnetic lines of force produced by passing a direct current in a straight conductor are :

1. Perpendicular to the conductor & coming outwards

2. Parallel to conductor

3. Surrounding the conductor and of circular nature

4. Perpendicular to the conductor & coming inwards

Q.

Which instrument can be used to show that magnetic field exists around a wire carrying current? Why does a compass needle get deflected when brought near a bar magnet? [3 MARKS]

Q.

Radio waves of constant amplitude can be generated with

1. Rectifier

2. Filter

3. F.E.T

4. Oscillator

Q.

What happens to the needle of a compass if you place the compass near a current carrying wire?

1. It gets deflected.

2. It gets charged.

3. It becomes hot.

4. It glows brightly.

Q.

When a wire is carrying current, the magnetic field around the conductor can be found by left-hand thumb rule.

1. True

2. False

Q.

The direction of the magnetic field in a straight current-carrying conductor is given by

1. Fleming's left-hand rule

2. Fleming's right-hand rule

3. Right-hand thumb rule

4. Clock rule

Q.

Which of the following correctly describes the magnetic field near a long straight wire carrying current?

1. Straight lines perpendicular to the wire

2. Straight lines parallel to the wire

3. Radial lines originating from the wire

4. Concentric circles centred on the wire

Q.

In the figure shown below, current is flowing in the anticlockwise direction in a loop of wire. The part of the loop that faces towards you is the south pole.

1. False

2. True

Q.

In the figure shown below, current is flowing in the anticlockwise direction in a loop of wire. The part of the loop that faces towards you is the

1. south pole

2. north pole

3. neither south nor north pole

4. Polarity depends on the strength of the current.

Q.

The electrical pulses from a microphone are strengthened using a/an ___.

1. amplifier

2. magnet

3. papercone

4. coil

Q. Why resonance does not operate in meta position

Q.

Which of the following correctly describes the magnetic field near a long straight wire?

1. The field consists of straight lines perpendicular to the wire

2. The field consists of straight lines parallel to the wire

3. The field consists of radial lines originating from the wire

4. The field consists of concentric circles centred on the wire

Q.

Which instrument can be used to show that magnetic field exists around a wire carrying current? Why does a compass needle get deflected when brought near a bar magnet? [3 MARKS]

Q. Which of the following correctly describes the magnetic field near a long straight wire?

1. The field consists of straight lines perpendicular to the wire
2. The field consists of straight lines parallel to the wire
3. The field consists of radial lines originating from the wire
4. The field consists of concentric circles centered on the wire

Q.

On which of the following factors does the magnetic field due to a current carrying straight wire depends?

1. Magnitude of current only.

2. Distance from the wire and magnitude of current.

3. The direction of the current only.

4. Distance from the wire only

Q.

A current is passed through a straight wire. Then the shape of lines of forces established around it is ?

1. Circular

2. Oval in shape

3. Straight lines

4. All of the above

Q. A person is standing next to a current carrying wire which lies horizontally such that he is pointing in the direction in which the current is flowing. The magnetic field to the person’s right is in which direction?

1. Vertically downwards
2. Towards his back
3. Facing to his left
4. Facing to his right

Q.

As we move away from the straight current carrying conductor, the spacing between the magnetic field lines ___.

1. increases

2. decreases

3. becomes zero

4. remains same

Q. The magnetic field lines due to a conductor are shown below. Then which of the following statements is true?

1. Current flows from B to A
2. Current flows from A to B
3. No current flows in AB
4. The current flowing through AB is alternating in nature.