NCERT Solutions for Class 10 Science Chapter 12: For students of various classes, the intext and exercise questions provided in the NCERT Books are a resource hub from the examination point of view. Thus it becomes important that students have access to the detailed and accurate answers to the questions. In this article we have covered the detailed answers for NCERT Class 10 Science Chapter 12 Magnetic Effects of Electric Current.
NCERT Books help students to gain an understanding of concepts and strengthen their basics. These books are recommended due to their explanation of even difficult topics in simple and clear language. Students can perform well in exams by referring to the NCERT Books.
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Questions given in the NCERT books are always considered very important as not only do they help you to analyse your understanding of the concepts involved in a chapter but also in preparing for the examinations. Students should read the chapters carefully along with attempting the questions given.
In this article students can check the NCERT Solutions for Class 10 Science Chapter 12. Students can download the NCERT Solutions for Class 10 Magnetic Effects of Electric Current in pdf format.
NCERT Class 10 Science Magnetic Effects of Electric Current Solutions
Students go through the questions and answers of NCERT Class 10 Chapter 12 Magnetic Effects of Electric Current. You can check the solutions for all the exercise and intext questions.
Intext Questions and Solutions Page no. 196
Q. Why does a compass needle get deflected when brought near a bar magnet?
Sol. Compass needle get deflected when brought near a bar magnet as its magnetic field lines interact with that of the bar magnet.
Intext Questions and Solutions Page no. 200
Q. Draw magnetic field lines around a bar magnet.
Sol. Magnetic field lines of a bar magnet emerge from the North Pole and terminate at the South Pole. Direction gets reversed inside the magnet.
Q. List the properties of magnetic field lines.
Sol. 1. Magnetic lines do not intersect with each other.
2. Magnetic field lines emerge from the North Pole.
3. They terminate at the South Pole.
4. The direction of field lines inside the magnet is from the South Poleto the North Pole.
Q. Why don’t two magnetic field lines intersect each other?
Sol. Magnetic lines are parallel to each other. Thus, they can’t intersect. Also, if two field lines of a magnet intersect, then at the point of intersection, the compass needle points in two different directions. Thus, two field lines do not intersect each other.
Intext Questions and Solutions Page no. 201
Q. Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.
Sol. For downward direction of current flowing in the circular loop, the direction of magnetic field lines will be as if they are emerging from the table outside the loop and merging in the table inside the loop. Similarly, for the upward direction of current flowing in the circular loop, the direction of magnetic field lines will be as if they are emerging from the table outside the loop and merging in the table inside the loop.
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Q. The magnetic field in a given region is uniform. Draw a diagram to represent it.
Sol. The magnetic field lines inside a current-carrying long straight solenoid are uniform.
Q. Choose the correct option.
The magnetic field inside a long straight solenoid-carrying current
(a) is zero. (b) decreases as we move towards its end. (c) increases as we move towards its end. (d) is the same at all points
Sol. (d)The magnetic field inside a long, straight, current- carrying solenoid is uniform.
It is the same at all points inside the solenoid.
Intext Questions and Solutions Page no. 203
Q. Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)
(a) mass (b) speed (c) velocity (d) momentum
Sol. (c) and (d)
When a proton enters in a region of magnetic field, it experiences a magnetic force. As a result of the force, the path of the proton becomes circular. Hence, its velocity and momentum change.
Q. In Activity 12.7, 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?
Sol. If a current-carrying conductor is placed in a magnetic field, it experiences a force. This force will increase with the increase in amount of current, strength of the magnetic field, and the length of the conductor. Thus, the magnetic force exerted on rod AB and its displacement will increase if
1. Current in rod AB is increased
2. A stronger horse-shoe magnet is used
3. Length of rod AB is increased
Q. A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
(a) towards south (b) towards east (c) downward (d) upward
Sol. (d) The direction of the magnetic field can be determined by the Fleming’s left hand rule. The direction of magnetic field will be upwards.
Intext Questions and Solutions Page no. 205
Q. Name two safety measures commonly used in electric circuits and appliances.
Sol. Two safety measures commonly used in electric circuits and appliances are:
Each circuit must be connected with an electric fuse. When the current passing through the wire exceeds the maximum limit of the fuse element, the fuse melts. It stops the flow of current through that circuit. Thus, protecting the appliances connected to the circuit.
Earthing is a necessary requisite as it helps in preventing electric shocks. Any leakage of current in an electric appliance is transferred to the ground and people using the appliance do not get the shock.
Q. An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
Sol. Current drawn by the electric oven can be obtained by the expression,
P=VI
I=P/V
Power of the oven, P= 2 kW = 2000 W
Voltage supplied, V= 220 V
I=2000/220=9.09A
Thus, the current drawn by the electric oven is 9.09 A, which exceeds the safe limit of the circuit. Fuse element of the electric fuse will melt and break the circuit.
Q. What precaution should be taken to avoid the overloading of domestic electric circuits?
Sol. The precautions that should be taken to avoid the overloading of domestic circuits are:
1. There should be fuse connected to the circuit.
2. Don’t connect too many appliances to a single socket.
3. Too many appliances should not be used at the same time.
4. Don’t use faulty appliances in the circuit.
NCERT Class 10 Science Chapter 12 Exercise Questions
Q. Which 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 centred on the wire.
Sol. (d) The field consists of concentric circles centred on the wire.
The magnetic field lines, produced around a straight current-carrying conductor, are concentric circles. Their centers lie on the wire.
Q. At the time of short circuit, the current in the circuit
(a) reduces substantially. (b) does not change. (c) increases heavily. (d) vary continuously.
Sol. (c) Increases heavily
When two naked wires of an electric circuit touch each other, the amount of current that is flowing in the circuit increases abruptly. This cause short-circuit.
Q. State whether the following statements are true or false.
(a) The field at the centre of a long circular coil carrying current will be parallel straight lines.
(b) A wire with a green insulation is usually the live wire of an electric supply
Sol. True;A long circular coil is a long solenoid. The magnetic field lines inside the solenoid are parallel lines.
False; Live wire has red insulation cover, whereas earth wire has green insulation colour in the domestic circuits.
Q. List two methods of producing magnetic fields.
Sol. By using a permanent magnet, we can produce a magnetic field.
A current-carrying straight conductor produces magnetic field.
Q. When is the force experienced by a current–carrying conductor placed in a magnetic field largest?
Sol. The force experienced by a current-currying conductor is the maximum when the direction of current is perpendicular to the direction of the magnetic field.
Q. Imagine that you are sitting in a 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?
Sol. The direction of magnetic field is given by Fleming’s left hand rule. Magnetic field inside the chamber will be perpendicular to the direction of current and direction of deflection i.e., either upward or downward. The direction of current is from the front wall to the back wall because negatively charged electrons are moving from back wall to the front wall. The direction of magnetic force is rightward. Thus, using Fleming’s left hand rule, the direction of magnetic field inside the chamber is downward.
Q. State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field.
Sol. i) Maxwell’s right hand thumb rule
(ii) Fleming’s left hand rule
(iii) Fleming’s right hand rule
Q. When does an electric short circuit occur?
Sol. Electric short circuits happen when somehow current flowing in the circuit increases. It can happen if the resistance of an electric circuit becomes very low. In such case, current flowing through the circuit becomes very high. This is caused by connecting too many appliances to a single socket or connecting high power rating appliances to the light circuits. Also, when the insulation of wires undergoes wear and tear, they touch each other, and then the current flowing in the circuit increases abruptly. Thus, a short circuit occurs.
Q. What is the function of an earth wire? Why is it necessary to earth metallic appliances?
Sol. Earthing helps in preventing electric shocks. Metallic body of electric appliances is connected to the earth by means of earth wire. Because of this, if there is any leakage of electric current, then current will transfer to the ground. This prevents any electric shock to the user. That is why earthing of electrical appliances is necessary.
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