NCERT Science Class 10 Chapter 13 Magnetic Effects of Electric Current CBSE Board Sample Problems Very Short Answer

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Question

How can you say that the magnetic field is uniform inside the solenoid?

Solution

Because field lines are parallel inside the solenoid.

Question

Name any two devices which use permanent magnets.

Solution

Loudspeakers, (Galvanometer, voltmeter).

Question

Where do we connect a fuse: with live wire or with neutral wire?

Solution

It is always connected with live wire.

Question

To which wire do you connect fuse wire in a house hold circuit

Solution

With live wire

Question

What is the function of a fuse in the domestic electric circuit?

Solution

A fuse (or fuse wire) is used to protect the electric circuit in case of short- circuiting of circuit or in case of overloading of the circuit

Question

On what factors does the magnitude of force experienced by a current-carrying conductor placed normally in a magnetic field depends

Solution

The force depends on

(i) Current flowing in the conductor,

(ii) Length of the conductor,

(iii) Strength of magnetic field and

(iv) Orientation of the conductor

Question

What happens to the magnetic field lines due to a current carrying conductor when the current is reversed?

Solution

The direction of magnetic field (and magnetic field liens) gets reversed on changing the direction of flow of current in a straight conductor

Question

What is the direction of magnetic field lines of a magnet?

Solution

From N-pole to S-pole outside the magnet, and from S-pole to N-pole inside a magnet

Question

Name the rule which is used to find the direction of induced current in any circuit.

Solution

Fleming’s Right hand rule.

Question

What is the role of green colored wire in the three pin devices in domestic connections?

Solution

The green colored wire is used as the Earth wire, which helps in transferring the excess current to the earth and protects the user from any electrical shock.

Question

Mention the frequency and voltage we receive at our homes.

Solution

Frequency = 50 Hz,

Voltage = 220 V

Question

Name the material used to make core of electromagnets.

Solution

Soft iron.

Question

Why two magnetic field lines cannot intersection?

Solution

Because at the point of intersection a new direction can be set which is practically not possible / At the point of intersection two directions can be set which cannot be detected with the help of a compass.

Question

Name any one factor on which magnetic field strength of solenoid depends on?

Solution

Number of turns / Current

Question

Rahul observed in an experiment that when a current carrying conductor in placed in direction perpendicular to the direction of magnetic field, conductor starts displacing from its original position, State the rule applicable. What will happen if conductor is placed parallel to the direction of magnetic field?

(1/2+1/2)

Solution

Fleming’s left-hand Rule (state) (1/2)

No force will act on conductor if placed parallel. (1/2)