NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

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NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2 Class 10 Science Class book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE Board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 10 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.

NCERT solutions for Class 10 Science Magnetic Effects of Electric Current Download as PDF

NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

NCERT Class 10 Science Chapter wise Solutions

  • 1 – Chemical Reactions and Equations
  • 2 – Acids, Bases and Salts
  • 3 – Metals and Non-metals
  • 4 – Carbon and Its Compounds
  • 5 – Periodic Classification of Elements
  • 6 – Life Processes
  • 7 – Control and Coordination
  • 8 – How do Organisms Reproduce?
  • 9 – Heredity and Evolution
  • 10 – Light Reflection and Refraction
  • 11 – Human Eye and Colourful World
  • 12 – Electricity
  • 13 – Magnetic Effects of Electric Current
  • 14 – Sources of Energy
  • 15 – Our Environment
  • 16 – Management of Natural Resources

NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

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

(a) The field consists of straight lines perpendicular to the wire.

(b) The field consists of straight lines parallel to the wire

(c) The field consists of radial lines originating from the wire

(d) The field consists of concentric circles centered on the wire

Ans. (d) The field consists of concentric circles centred on the wire.


2. The phenomenon of electromagnetic induction is

(a) the process of charging a body.

(b) the process of generating magnetic field due to a current passing through a coil.

(c) producing induced current in a coil due to relative motion between a magnet and the coil.

(d) the process of rotating a coil at an electric motor.

Ans. (c) producing induced current in a coil due to relative motion between a magnet and the coil.


3. The device used for producing electric current is called

(a) generator

(b) galvanometer

(c) ammeter

(d) motor

Ans. (a) generator


4. The essential difference between A.C. generator and a D.C. generator is that

(a) A.C. generator has an electromagnet while a D.C. generator has permanent magnet.

(b) D.C. generator will generate a higher voltage

(c) A.C. generator will generate a higher voltage

(d) A.C. generator has slip rings while the D.C. generator has commutator.

Ans. (d) A.C. generator has slip rings while the D.C. generator has commutator.


5. At the time of short circuit, the current in the circuit:

(a) reduce substantially

(b) does not change

(c) increase heavily

(d) vary continuously

Ans. (c) increase heavily


6. State whether the following statements are true or false.

(a) An electric motor converts mechanical energy into electrical energy.

(b) An electric generator works on the principle of electromagnetic induction.

(c) The field at the centre of a long circular coil carrying current will be parallel straight line

(d) A wire with green insulation is usually the live wire of an electric supply.

Ans. (a) False

(b) True

(c) True

(d) False


7. List three methods of producing magnetic field.

Ans. Three methods of producing magnetic fields are as follows:

(a) Magnetic field can be produced by placing a permanent magnet or a horse-shoe magnet at the place, where magnetic field is required.

(b) Magnetic field is produced around a current carrying straight conductor or a current carrying coil.

(c) A very good method to produce magnetic field is due to flow of current in a solenoid.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

8. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current carrying solenoid with the help of a bar magnet? Explain.

Ans. When current is passed through a solenoid coil, magnetic field is produced due to presence of turns in same direction. As a result, the resultant magnetic field is very strong and uniform. Solenoid behaves like a strong bar magnet.

We can determine the poles of magnet formed by solenoid. The end of solenoid connectd with positive terminal behaves like South Pole and the end connected with negative terminal behaves as North Pole.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

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

Ans. The force experienced by a current carrying conductor placed in a magnetic field is largest when the conductor is placed with its length in a direction perpendicular to that of magnetic field.


10. Imagine that you are sitting in chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

Ans. An electron beam moving horizontally from back wall towards the front wall is equivalent to a current flowing in the opposite direction. The deflection of electron beam as seen by the observer is to his right side. On applying Fleming’s left-hand rule we find that the magnetic field is acting in vertically downward direction.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

11. Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of split ring in an electric motor?

Ans. Electric motor labelled diagram of an electric motor is as follows:

Principle: A current-carrying conductor, when placed in a magnetic field, experiences a force. If the direction of magnetic field and that of current are mutually perpendicular, then force acting on the conductor will be perpendicular to both and will be the given by Fleming’s left-hand rule. Due to this force the conductor begins to move, if it is free to rotate.

Working: Let the current in the coil ABCD of motor enters from the source battery through the conducting brush X, flow along ABCD and finally flows back to the battery through brush Y. On applying Fleming’s left-hand rule we find that force acting on arm AB due to magnetic field pushes it downwards. But the force acting on arm CD pushes it upwards. Thus, the coil and the axle rotate anticlockwise. Due to action of split rings P and Q change their contacts with brushes. Now, P makes contact with Y and Q with X. As a result, Current begins to flow in coil along DCBA. The arms are pushed in opposite direction and coil continues to rotate in same direction.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

12. Name some devices in which electric motors are used.

Ans. Electric motors are used in all devices where we want to convert electrical energy into mechanical energy. In our houses, electric motors, coolers, mixer grinders, washing machines, computers etc motor is used.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

13. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil. (ii) withdrawn from inside the coil (iii) held stationary inside the coil?

Ans. (i) When a bar magnet is pushed into the coil of insulated copper wire connected to a galvanometer, galvanometer gives a deflection towards left.

(ii) When the bar magnet is withdrawn from inside the coil, again an induced current is set in coil that deflect the galvanometer towards right.

(iii) If the bar magnet is held stationary inside the coil, then no induced current is set and galvanometer does not show any deflection.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

14. Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Ans. Yes, a current is induced in the coil B.

When the current in the coil A is changed, the magnetic field associated with it also changes. As coil B is placed close to A, hence magnetic field lines around this coil also change. Due to change in magnetic field lines associated with coil B, an induced current is also induced in it.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

15. State the rule to determine the direction of a (i) magnetic field produced around a straight current carrying conductor (ii) force experienced by a current carrying straight conductor (iii) current induced in a coil due to its rotation in a magnetic field.

Ans. (i) To know the direction of magnetic field produced around a straight conductor we make use “Right hand thumb Rule”.

(ii) To find the direction of force experienced by a current carrying straight conductor placed in a magnetic field we make use “Fleming’s left hand rule”.

(iii) For finding the direction of current induced in a coil we use “Fleming’s right hand rule”.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

16. Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

Ans. Electric generator labelled diagram is as follows:

Principle: An electric generator works on the principle of electromagnetic induction.

Working: Let the in the beginnings brushes and are kept pressed separately on rings and respectively. Let the axle attached to the rings is rotated such that arm AB of the coil moves up and arm CD moves down in the magnetic field. Due to rotation of arms AB and CD induced current are set up in them. As per Fleming’s right hand rule, induced current in these arms along the directions AB and CD respectively and current flows into and .

After half rotation, arm AB moves downward and arms CD upward to change the direction opposite to first case. Thus, after every half rotation current changes its direction and an alternate current is obtained in the generator.

Brushes are kept pressed on the two slip rings separately. Outer ends of the brushes are connected to the galvanometer. Thus, brushes help in transferring current from the coil ABCD to external circuit.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

17. When does an electric short circuit occurs?

Ans. If either the insulation of wires used in an electric circuit is damaged or there is a fault in the appliances, live wire and neutral wire may come in direct contact. As a result, the current in the circuit abruptly rises and short circuiting occurs.


NCERT Solutions for Class 10 Science Magnetic Effects of Electric Current Part 2

18. What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Ans. The earth wires functions as a safety measure, especially for those appliances that have a metallic body, like heater, electric, press, room cooler etc.

The metallic body of the appliance is connected to the earth wire, which provides a low resistance conducting path for electric current. It ensures that any leakage of current to the metallic body of an appliance keeps it potential same as of earth. As a result, the user would not get severe electric shock, even if he touches the body of appliance.

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