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Ch 12 – Magnetic Effects of Electric Current
![NCERT Solutions for Class 10 Science Chapter 12 Exercise](https://solutionsir.com/wp-content/uploads/2023/05/class-10-science-chapter-12.jpg)
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NCERT Solutions for Class 10 Science Chapter 12 Exercise β You learnt about the heating effect of electric current in the previous chapter. But do you know that an electric current-carrying wire can behave like a magnet. Also, think vice versa, or what about the electric effect of moving magnets? β‘ In the twelfth chapter “Magnetic Effects of Electric Current” (Chapter 12 Science Class 10), we will study magnetic fields and electromagnetic effects to learn about the (i) magnetic effect of electric current, and (ii) electric effect of moving magnets.
Chapter 12 Magnetic Effects of Electric Current β Important Points: A magnetic field exists in the region surrounding a magnet, in which the force of the magnet can be detected. Field lines are used to represent a magnetic field. A metallic wire carrying an electric current has associated with it a magnetic field. The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor.
Special Note: π Click the βPrepareβ button to know, how to prepare Magnetic Effects of Electric Current chapter for exams. Get more helpful information, watch explanation videos and pay attention to handwritten version of our answer to score π― good marks in class 10 Science NCERT solutions Chapter 12. You will get everything that you need to prepare a question thoroughly.
NCERT Solutions for Class 10 Science Chapter 12
Table of Contents
Page 196
EX 1 β Chapter no 12 β Page 196 Solutions
Question 1: Why does a compass needle get deflected when brought near a bar magnet?
Answer: The magnetic field of the magnet exerts force on both the poles of the compass needle. These two forces form a couple which deflects the compass needle.
End of Page no 196 solutions β In text exercise 1 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 200
EX 2 β Chapter no 12 β Page 200 Solutions
Question 1: Draw magnetic field lines around a bar magnet.
Answer: Magnetic field lines around a bar magnet are shown in below image β
![Draw magnetic field lines around a bar magnet](https://solutionsir.com/wp-content/uploads/2023/01/bar-magnet-field.jpg)
Question 2: List the properties of magnetic field lines.
Answer: Properties of magnetic lines of force β
- The magnetic field lines originate from the north pole of a magnet and end at its south pole.
- The magnetic field lines become closer to each other near the poles of a magnet but they are widely separated at other places.
- Two magnetic field lines do not intersect one another.
Question 3: Why donβt two magnetic field lines intersect each other?
Answer: If two magnetic field lines of force intersect each other then at the point of intersection, the compass needle would show two different directions which is not possible.
End of Page no 200 solutions β In text exercise 2 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 201
EX 3 β Chapter no 12 β Page 201 Solutions
Question 1: 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.
Answer: You can see in the image below that each section of wire produces its concentric set of lines of force.
![Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop](https://solutionsir.com/wp-content/uploads/2023/01/magnetic-field-through-loop.jpeg)
Now, by applying the right hand thumb rule, we find that all the sections produce magnetic field downwards at all points inside the loop while at the outside points, the field is directed upwards. Therefore, the magnetic field acts normally into the plane of the paper at the points inside the loop and normally out of the plane of paper at points outside the loop.
Question 2: The magnetic field in a given region is uniform. Draw a diagram to represent it.
Answer: Uniform magnetic field could be represented by drawing parallel and equidistant straight lines, all pointing in the same direction β
![Draw a diagram to represent uniform magnetic field in a given region](https://solutionsir.com/wp-content/uploads/2023/01/uniform-magnetic-field.jpg)
End of Page no 201 solutions β In text exercise 3 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 202
EX 3 Continues β Page 202 Solutions
Question 3: Choose the correct option.
The magnetic field inside a long straight solenoid-carrying current
The magnetic field inside a long straight solenoid-carrying current
Answer: (d) is the same at all points.
End of Page no 202 solutions β In text exercise 3 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 203
EX 4 β Chapter no 12 β Page 203 Solutions
Question 1: 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.)
Answer: (c) velocity, and (d) momentum
End of Page no 203 solutions β In text exercise 4 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 204
EX 4 Continues β Page 204 Solutions
Question 2: In Activity 12.7, how do we think the displacement of rod AB will be affected if, (i) β current in rod AB is increased; (ii) β a stronger horse-shoe magnet is used; and (iii) β length of the rod AB is increased?
Answer: (i) When the current in the rod AB is increased, force exerted on the conductor increases, so the displacement of the rod increases.
(ii) When a stronger horse-shoe magnet is used, the magnitude of the magnetic field increases. This increases the force exerted on the rod and the displacement of the rod.
(iii) When the length of the rod AB is increased, force exerted on the conductor increases, so the displacement of the rod increases.
Question 3: A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is β
Answer: (d) upward
End of Page no 204 solutions β In text exercise 4 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 205
EX 5 β Chapter no 12 β Page 205 Solutions
Question 1: Name two safety measures commonly used in electric circuits and appliances.
Answer: Two safety measures are β
(i) Earthing
(ii) Electric fuse
Question 2: 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.
Answer: The current drawn by the electric oven,
I = P/V
Substituting the values,
I = 2000/220 = 9.09 A
The current drawn by the electric oven is 9.09 A which exceeds the safe limit of the circuit. Due to excessive current, the fuse wire will blow and the circuit will break.
Question 3: What precaution should be taken to avoid the overloading of domestic electric circuits?
Answer: Precautions to avoid the overloading of domestic electric circuits β
(i) Too many appliances should not be connected to a single socket.
(ii) Wires used in the circuit must be coated with good insulating materials like PVC.
(iii) Fuse should be connected in the circuit.
End of Page no 205 solutions β In text exercise 5 β chapter number 12 intext questions. NCERT Solutions for Class 10 Science Chapter 12.
Page 207
Chapter End Questions β Exercise 6 β Page 207 Solutions
Question 1: Which of the following correctly describes the magnetic field near a long straight wire?
Answer: (d) The field consists of concentric circles centered on the wire.
Question 2: At the time of short circuit, the current in the circuit
Answer: (c) increases heavily.
Question 3: State whether the following statements are true or false.
(a)βThe field at the centre of a long circular coil carrying current will be parallel straight lines.
Answer: True
(b)βA wire with a green insulation is usually the live wire of an electric supply.
Answer: False
Question 4: List two methods of producing magnetic fields.
Answer: Two methods of producing magnetic fields are β
(i) The permanent magnet produces a magnetic field around it.
(ii) Passing current through a conductor also produces the magnetic field.
Question 5: When is the force experienced by a currentβcarrying conductor placed in a magnetic field largest?
Answer: The force experienced by a current-carrying conductor is largest when the direction of the current is perpendicular to the direction of the magnetic field.
Question 6: 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?
Answer: The direction of the magnetic field is vertically downwards. The direction of current is from the front wall to the back wall because negatively charged electrons are moving from the back wall to the front wall. The direction of magnetic force is rightward. Hence, using Fleming’s left hand rule, it can be concluded that the direction of magnetic field inside the chamber is downward.
Question 7: State the rule to determine the direction of a (i) β magnetic field produced around a straight conductor-carrying current, (ii) β force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) β current induced in a coil due to its rotation in a magnetic field.
Answer: (i) Maxwellβs right hand thumb rule.
(ii) Flemingβs left hand rule.
(iii) Flemingβs right-hand rule.
Question 8: When does an electric short circuit occur?
Answer: 1 – When too many appliances are connected to a single socket or when high power rating appliances are connected to a light circuit, the resistance of the circuit becomes low as a result the current flowing through the circuit becomes very high. This condition results in a short-circuit.
2 – When live wires whose insulation have worn off come in contact with each other, the current flowing in the circuit increases abruptly which results in a short circuit.
Question 9: What is the function of an earth wire? Why is it necessary to earth metallic appliances?
Answer: It is necessary to earth metallic appliances because it ensures that if there is any current leakage in the metallic cover, the potential of the appliance becomes equal to that of the earth. The potential of the earth is zero. As a result, the person handling the appliance will not get an electric shock.
End of Page no 207 solutions β Ch 12 Ex 6 β Chapter end question answer. NCERT Solutions for Class 10 Science Chapter 12.