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NCERT Solutions For Class 10 Science Chapter 13 | Vidyakul

Download in PDF format or use it online without downloading free. Law Of Magnetic Poles: It states that like poles repel while unlike poles of magnets attracts each. Thus, two N-poles repels, two S-poles repel while N-pole attracts S-pole. Some basic properties of magnets are as follows: i Attractive property: a magnet attracts small pieces of iron, cobalt, nickel.

It is not possible to obtain an isolated N-pole or S-pole. Magnetic lines of force: A magnetic line of force may be defined as the curve the tangent to which at any point gives the direction of Ncert Solutions For Class 10th Science Chapter 6 Work the magnetic field at that point. It may also be defined as the path along with a free north pole tends to. Properties of line of force: i These are closed curves which start in air from N-pole and end at the S-pole and then return to the N-pole through the interior of the magnet.

This explains attraction between unlike poles and repulsion between like poles. Uses of magnets: i Magnets are used in radio and stereo speakers. A magnetic field line may be defined as the path along with a unit north pole tends to. The direction of magnetic field is determined by placing a small compass needle.

The direction of deflection of N-pole of the compass needle gives the direction of the magnetic field at that point. We know that an electric current flowing through a conductor produces a magnetic field. This field exerts a force on a magnet placed near the conductor. Thus a magnetic field exerts a force on a current-carrying conductor.

Such a force was first suggested and demonstrated experimentally by French Scientist Andre Marie Ampere in The magnitude of the induced current can be decreased by rapidly increasing or decreasing the number of magnetic field lines passing through a closed coil. Earthing: Earthing of an electrical appliance means connecting the metallic body of the high powered appliance electric iron, toaster, refrigerator, oven.

The earth wire has green insulation cover and is connected to a metal plate deep in the earth near the house and hence it is at zero potential. Function and importance of earthing: If, by chance, the live wire touches the metallic body of the electrical appliance, its current flows to the earth through the earth wire, which provides a low resistance conducting path for the current.

Thus, the earth wire or earthing is used as a safety ncert solutions for class 10th science chapter 13 code which ensures any leakage of current to the metallic body of the appliance keeps its potential equal to that of the earth zero volt and the user may not get a severe electric shock. Question 1: In a household circuit, why are all the distribution circuit kept in parallel?

OR What are the advantages of connecting different electrical appliances in parallel? Mention any three advantages. Answer 1: It has the following advantages: i If one line is overloaded, the fuse in this circuit only will be blown off, other distribution lines are protected. Question 2: State Oersted observation. OR How can it be shown that a magnetic field exist around a wire through which a direct electric current ncert solutions for class 10th science chapter 13 code passing?

Answer 2: An magnetic needle brought close to a straight current carrying wire aligns itself perpendicular to the wire, reversing the direction of current reverses the direction of deflection. This shows that the current carrying wire is associated with a magnetic field. Question 1: Explain the meaning of the term electromagnetic induction.

In what factors does the value of induced current produced in a circuit depend? Name and state the rule used for determination of direction of induced current. State one practical application of this phenomenon in everyday life. Answer 1: i The term electromagnetic induction means including electricity by magnetism. Whenever, the magnetic flux linked with a closed circuit changes, an induced potential and hence an induced current is set up in it.

This phenomenon is called electromagnetic induction. Question 2: What are direct and alternating currents? OR What is difference between direct current and alternating current? Answer 2: Direct Current: A direct current is that current which flows with constant magnitude in the same direction.

Alternating Current: An alternating current is that current whose magnitude changes continuously with time and whose direction reverses after equal intervals of time. Important Questions related to Chapter 13 of class 10 Science and previous years board questions are also given with solutions and proper answers.

State the law of magnetic poles. Give some basic properties of magnets. What are magnetic lines of force? Give their ncert solutions for class 10th science chapter 13 code properties. Mention some important uses of magnets in everyday life. What are magnetic field lines? How is the direction of a magnetic field at a point determined? Ncert solutions for class 10th science chapter 13 code does a current-carrying conductor experience a force in a magnetic field?

In what way can the magnitude of the induced current be increased? What is the function of an earth wire? Why is it necessary to earth the metallic appliances? Important Questions on 10th Science Chapter 13 List three sources of magnetic fields. Three methods of producing magnetic field are as follows: Magnetic field can be produced by placing a permanent bar magnet or a horse-shoe magnet at the place, where magnetic field is required.

Magnetic field is produced around a current-carrying straight conductor or a current carrying circular coil. A very good method to produce magnetic field is due to flow of current in a ncert solutions for class 10th science chapter 13 code. When is the force experienced by a current�carrying conductor placed in a magnetic field largest?

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

Name some devices in which electric motors are used. Electric motors are used in all such devices where we want to convert electrical energy into mechanical energy so as to drive that machine.

In our houses, electric motors are being fitted in electric fans, coolers, air conditioners, mixer grinders, washing machines, refrigerators, juicers, computers.

In factories, motors are used in almost all machines. 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 ncert solutions for class 10th science chapter 13 code coil, iii held stationary inside the coil?

A current induces in a solenoid if a bar magnet is moved relative to it. This is the principle of electromagnetic induction. As a result, the needle of the galvanometer deflects momentarily in a particular direction. As a result, the needle of the galvanometer deflects momentarily in the opposite direction. Hence, galvanometer will show no deflection. Two circular coils A and B are placed closed to each.

If the current in the coil A is changed, will some current be induced in the coil B? Give reason. 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.

When does an electric short circuit occur? If either the insulation of wires used in an electrical circuit is damaged or there is a fault in the appliance, live wire and neutral wire may come in direct contact. As a result, the current in the circuit abruptly rises and short-circuiting occurs.

Why is it necessary to earth metallic appliances? The metallic body of electric appliances is connected to the earth by means of earth wire so that any leakage of electric current is transferred to the ground. This prevents any electric shock to the user. That is why earthing of the electrical appliances is necessary. Why does a compass needle get deflected when brought near a bar magnet? Magnetic compass needle and bar magnet both have magnetic field.

When they brought near to each other, these magnetic fields interact each other giving deflection in needle. No two field-lines are found to cross each. If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible. If the first finger points in the ncert solutions for class 10th science chapter 13 code of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.

What is the principle of an electric motor? The working principle of an electric motor is based on the magnetic effect of current. A current-carrying loop experiences a force and rotates when placed in a magnetic field. What is the role of the split ring in an electric motor?

The split ring in the electric motor acts as a commutator. The commutator reverses the direction of current flowing through the coil after each half rotation of the coil. Due to this reversal of the current, the coil continues to rotate in the same direction. What is the principle of an electric generator? An electric generator is based on the principle of electromagnetic induction.

The chapter is meant to provide an insight into topics such as generators, motors, electromagnetic inductions, and much more. If the current in the coil A is changed, will some current be induced in the coil B? From the carbon brushes B 1 and B 2 , we can take the current into the various electrical appliances like radio, T. Password must be atleast 8 characters long. This process continues.

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