Right Hand Thumb Rule

Q.

State and explain Maxwell's right-hand thumb rule.

Q. 6, A parabolic section of wire OA is located in xy plane and carries a current of 12A. A uniform magnetic field of 4T making an angle 60^° with x-axis exists in xy plane. Calculate the magnetic force (in N) on wire O

Q.

What is a radial magnetic field?

Q.

State and explain the Clock face rule for determining the polarities of a circular wire carrying current.

Q.

The strength of a magnetic field around an infinite current carrying conductor is

1. same everywhere

2. directly proportional to distance

3. inversely proportional to distance

4. inversely proportional to the square of the distance

Q.

What do you mean by the clock face rule?

Q.

State a law which determines the direction of magnetic field around a current carrying wire.

Q.

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 when the point is _____ .

1. at a point located in the plane of the paper, on the north side of the wire

2. directly above the wire

3. directly below the wire

4. at a point located in the plane of the paper, on the south side of the wire

Q.

What is the other name of Maxwell's right-hand thumb rule ?

Q.

Name and state the rule by which the polarity at the ends of a current carrying solenoid is determined.

Q.

An electron enters into the magnetic field and perpendicular to it, as shown in the figure. The direction of the force acting on the electrons will be?

1. Into the page.

2. To the left.

3. To the right.

4. Out of the page.

Q.

The induced currents direction is such that it opposes the cause of its generation. This is the rule of

1. Lenz

2. Faraday

3. Kirchhoff

4. Fleming

Q.

When the thumb of a right hand is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.

1. direction of current
2. the direction opposite to that of current
3. towards North
4. vertically upwards

Q.

The magnetic field associated with a current-carrying straight conductor is in anticlockwise direction. If the conductor was held along the east-west direction, what will be the direction of current through it ? Name and state the rule applied to determine the direction of current ?

Q.

The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be

1. Horizontal

2. Vertical

3. Clockwise

4. Anticlockwise

Q. Two straight infinitely long thin wires are spaced 0.1 m apart and carry a current of 10 ampere each. Find the magnetic field at a point 0.1m from both the wires in the two cases when the currents are in the : A) same direction B) opp direction

Q.

A current-carrying conductor is held in exactly in a vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor :

(a) from top towards bottom (b) from left towards right

(c) from bottom towards top (d) from right towards left

Q.

If a conducting wire is placed along the x-axis and a current flow through it in the positive direction, it creates a magnetic field around it. The direction of the magnetic field at a point (0, -2) is negative z-axis i.e. inside the plane.

1. In the positive x direction

2. Positive y-direction

Q.

A thick wire is hanging from a wooden table. An anticlockwise magnetic field is to be produced around the wire by passing current through this wire by using a battery. Which terminal of the battery should be connected to the :

(a) top end of wire ?

(b) bottom end of wire ?

Give reason for your choice.

Q.

A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table ?

Q.

When we bring a magnetic compass needle near a current-carrying wire

1. It makes the magnetic needle point north-south

2. It makes the magnetic needle point east-west

3. It has no effect on the magnetic needle

4. It deflects the magnetic needle in any direction.

Q.

Consider a proton in a uniform magnetic field. Which of the following parameter changes while it moves freely in a uniform magnetic field?

1. Mass

2. Speed

3. Velocity

4. None of these

Q.

Induced current found to be highest when coil moves

1. Parallel to magnetic field

2. Right angles to magnetic field

3. At an angle of 20^o

4. At an angle of 45^o

Q. The magnetic flux linkage with a circuit of resis†an ce 100 ohm increases from 10 to 60 weber. The amount of induced charges that flow in the circuit is (in coulomb)

Q. 3. A square loop of side 6 cm carries a current of 30 A. Calculate the magnitude of magnetic field B at a point P lying on the axis of the loop and a distance 7 cm from centre of the loop.

Q.

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

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

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

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

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

Q.

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

1. Vertically downwards

2. Facing to his right

3. Vertically upwards

4. Facing to his left

Q.

According to the right-hand thumb rule, if the thumb points in the direction of current, then the other fingers encircle in the direction of the _____.

1. motion
2. force
3. magnetic field
4. current

Q.

If a conducting wire is placed along the x-axis and a current flows through it in the positive direction, it creates a magnetic field around it. The direction of the magnetic field at a point (0, -2) is towards the negative z-axis i.e. inside the plane.

1. In the positive x direction

2. Positive y-direction

Q. The direction of magnetic field lines of a current carrying conductor can be found out using the rule.

1. right hand thumb
2. Fleming's right hand
3. Fleming's left hand
4. left hand thumb