# CBSE Solutions for Class 10 Physics

#### Select CBSE Solutions for class 10 Subject & Chapters Wise :

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

Answer :

When the direction of the current is perpendicular to the direction of the magnetic field is when the force experienced is the largest.

What precaution should be taken to avoid the overloading of domestic electric circuits?

Answer :

A few of the precautions to be taken to avoid the overloading of domestic electric circuits are as follows:
•    Connecting too many devices to a single socket should be avoided
•    Using too many appliances at the same time should be avoided
•    Faulty appliances should not be connected to the circuit

Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
1.    two revolutions
2.    one revolution
3.    half revolution
4.    one-fourth revolution

Answer :

c. half revolution
When a rectangular coil is rotated in magnetic field, the direction of the induced current changes once in half revolution. As a result, the direction of the current in the coil remains the same.

Which sources produce alternating current?

Answer :

Power plants and AC generators are some of the sources that produce alternating current.

Name some sources of direct current.

Answer :

DC generator and cell are some sources of direct current.

State the principle of an electric generator.

Answer :

Electric generator works on the principle of electromagnetic induction. In a generator, electricity is generated by rotating a coil in the magnetic field.

Explain different ways to induce current in a coil.

Answer :

Following are the different ways to induce current in a coil:
•    If the coil is moved rapidly between the two poles of horse shoe magnet, electric current is induced in the coil.
•    When a magnet is moved relative to the coil, an electric current is induced in the coil.

What is the role of split ring in an electric motor?

Answer :

Split ring plays the role of commutator in an electric motor. The commutator reverses the direction of the current flowing through the coil after each half rotation of the coil. Due to this reversal of current, the coil continues to rotate in the same direction.

What is the principle of an electric motor?

Answer :

The working principle of electric motor is based on the magnetic effect of current. A current carrying conductor when placed in a magnetic field experiences force and rotates. The direction of the rotation of the conductor can be determined by Fleming’s Left hand rule.

State Fleming’s left-hand rule.

Answer :

Fleming’s Left hand rule states that if we arrange our thumb, forefinger and middle finger of the left hand at right angles to each other, then the thumb points towards the direction of the magnetic force, the forefinger points towards the direction of magnetic field and the middle finger points towards the direction of current.

In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased; (ii) a stronger horse-shoe magnet is used; and (iii) length of the rod AB is increased?

Answer :

A current carrying conductor when placed in a magnetic field experiences force. The magnitude of this force will increase with the increase in the amount of current, length of conductor and the strength of the magnetic field. Hence, the strength of the magnetic force exerted on the rod AB and its displacement will increase if
1.    The current in rod AB is increased
2.    Stronger horse shoe magnet is used
3.    When the length of the rod AB increases

Why don’t two magnetic field lines intersect each other?

Answer :

If two magnetic field lines intersect then at the point of intersection the compass needle shows two different directions, which is not possible, hence they do not intersect with each other.

By convention the magnetic field lines emerge from …………… pole and merge at …………… pole.

Answer :

Answer: north, south

A coil of many circular turns of insulated copper wire wrapped closely in shape of a cylinder is called a ……………

Answer :

solenoid

An electric motor is rotating device that converts …………… energy to …………… energy.

Answer :

electrical, mechanical

AC generator converts …………… energy into …………… energy.

Answer :

mechanical, electrical

The difference between the direct current and alternating current is that the direct current flows in …………… direction, whereas the alternating current …………… its direction periodically.

Answer :

one, reverses

At the centre of current carrying loop the magnetic field appears to be a ……………

Answer :

straight line

Why does a compass needle get deflected when brought near a bar magnet?

Answer :

The compass needle is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of bar magnet, which causes the compass needle to deflect.

List the properties of magnetic field lines.

Answer :

The properties of magnetic field lines are as follows:
•    Magnetic field lines do not intersect with each other.
•    They emerge from the North Pole and terminate at the South Pole.
•    Inside the magnet, the direction of the field lines is from the South Pole to the North Pole.

Name two safety measures commonly used in electric circuits and appliances.

Answer :

The safety measured commonly used in electric circuits are as follows:

1. Fuse

Each circuit should be connected to a fuse because a fuse prevents the flow of excessive current through the circuit. When the current in the circuit exceeds the maximum limit of the fuse element, the fuse melts to stop the flow of current protecting the appliance connected to circuit.

1. Earthing

Earthing protects the user from electric shocks. Any leakage of current in an appliance is transferred to the ground by earthing and the people using the appliance is prevented from getting electrocuted.

A positively-charged particle (alpha-particle) projected towards the west is deflected towards north by a magnetic field. The direction of magnetic field is

• towards south
• towards east
• downward
• upward

Answer :

The direction of the magnetic field can be determined using the Fleming’s Left hand rule. According to the rule, if we arrange our thumb, forefinger and the middle finger of the left hand right perpendicular to each other, then the thumb points towards the direction of the magnetic force, the middle finger the direction of current and the forefinger the direction of magnetic field. Since the direction of positively charged particle is towards west, the direction of the current will also be towards the west. The direction of the magnetic force is towards the north, hence the direction of magnetic field will be upward according to Fleming’s Left hand rule.

Match the following columns

 Column I Column II 1. Right hand thumb rule (а) converts electrical energy into mechanical energy 2. Fleming’s left hand rule (b) gives the direction of magnetic field around a conductor 3. Fleming’s right hand rule (c) converts mechanical energy into electrical energy 4. Alternating current (d) gives the direction of force on current carrying conductor placed in magnetic field 5. Direct current (e) the direction of current changes periodically 6. Electric motor (f) gives the direction of induced current 7. Generator (g) current always flows in one direction.

Answer :

 Column I Column II 1. Right hand thumb rule (b) gives the direction of magnetic field around a conductor 2. Fleming’s left hand rule (d) gives the direction of force on current carrying conductor placed in magnetic field 3. Fleming’s right hand rule (f) gives the direction of induced current 4. Alternating current (e) the direction of current changes periodically 5. Direct current (g) current always flows in one direction. 6. Electric motor (а) converts electrical energy into mechanical energy 7. Generator (c) converts mechanical energy into electrical energy

 a. Principle of electric generator Fuse b. Magnetic field around a straight conductor Electromagnetic induction c. The safety device which is used to protect the circuit from short circuiting and overloading Concentric circles

Answer :

a. Electromagnetic induction
b. Concentric circles
c. Fuse

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The GSEB Books for class 10 are designed as per the syllabus followed Gujarat Secondary and Higher Secondary Education Board provides key detailed, and a through solutions to all the questions relating to the GSEB textbooks.

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For more details about the GSEB books for Class 10, you can access the PDF which is as in the above given links for the same.