English Medium Class 10 - CBSE Question Bank Solutions

The magnetic field lines in the middle of the current-carrying solenoid are?

(a) circles
(b) spirals
(c) parallel to the axis of the tube
(d) perpendicular to the axis of the tube

The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of circular wire is:

(a) clockwise
(b) downwards
(c) anticlockwise
(d) upwards

A current-carrying straight wire is held in exactly vertical position. If the current passes through this wire in the vertically upward direction, what is the direction of magnetic field produced by it? Name the rule used to find the direction of magnetic field. 

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

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

What happens when a current-carrying conductor is placed in a magnetic field?

When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

In a statement of Fleming's left-hand rule, what do the following represent?

(a) direction of centre finger.
(b) direction of forefinger.
(c) direction of thumb.

For Fleming's left-hand rule, write down the three things that are 90° to each other, and next to each one write down the finger or thumb that represents it.

 A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor.

State two ways to increase the force on a current-carrying conductor in a magnetic field.

 Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field. 

State Fleming's left-hand rule. Explain it with the help of labelled diagrams.

The force experienced by a current-carrying conductor placed in a magnetic field is the largest when the angle between the conductor and the magnetic field is: 

 45°
 60°
 90°
 180°

The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is: 

 45°
 60°
 90°
 180°

A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in Figure below: 

The force on the wire due to the magnet is directed: 

fron N to S
 from S to N
 vertically downwards
 vertically upwards

A horizontal wire carries a current as shown in Figure below between magnetic poles N and S: 

Is the direction of the force on the wire due to the magnet:

(a) in the direction the current
(b) vertically downwards
(c) opposite to the current direction
(d) vertically upwards 

In the simple electric motor of figure given below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil  

Is the current flowing clockwise or anticlockwise around the coil when viewed from above? 

If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction of force in the wire?

Which way does the wire in the diagram below tend to move?