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A short magnet is moved along the axis of a conducting loop. S
Concepts of Physics by H. C. Verma
Concepts of Physics

Class 12

HC Verma Part II

Author:
H. C. Verma
Subject:
Physics
1

Chapter 1: Heat and Temperature

64 questions

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2

Chapter 2: Kinetic Theory of Gases

100 questions

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3

Chapter 3: Calorimetry

41 questions

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4

Chapter 4: Laws of Thermodynamics

51 questions

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5

Chapter 5: Specific Heat Capacities of Gases

65 questions

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6

Chapter 6: Heat Transfer

82 questions

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7

Chapter 7: Electric Field and Potential

106 questions

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8

Chapter 8: Gauss's Law

46 questions

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9

Chapter 9: Capacitors

94 questions

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10

Chapter 10: Electric Current in Conductors

126 questions

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11

Chapter 11: Thermal and Chemical Effects of Electric Current

46 questions

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12

Chapter 12: Magnetic field

91 questions

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13

Chapter 13: Magnetic field due to a Current

92 questions

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14

Chapter 14: Permanent Magnets

54 questions

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15

Chapter 15: Magnetic Properties of Matter

31 questions

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16

Chapter 16: Electromagnetic Induction

133 questions

Q1
The coil of a moving-coil galvanometer keeps on oscillating for a long time if it is deflected and released. If the ends of the coil are connected together, the oscillation stops at once. Explain.
Q2
A short magnet is moved along the axis of a conducting loop. Show that the loop repels the magnet if the magnet is approaching the loop and attracts the magnet if it is going away from the loop.
Q3
Two circular loops are placed coaxially but separated by a distance. A battery is suddenly connected to one of the loops establishing a current in it. Will there be a current induced in the other loop? If yes, when does the current start and when does it end? Do the loops attract each other or do they repel?
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17

Chapter 17: Alternating Current

51 questions

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18

Chapter 18: Electromagnetic Waves

30 questions

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19

Chapter 19: Electric Current through Gases

49 questions

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20

Chapter 20: Photoelectric Effect and Wave Particle Duality

69 questions

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21

Chapter 21: Bohr'a Model and Physics of the Atom

75 questions

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22

Chapter 22: X-rays

59 questions

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23

Chapter 23: Semiconductors and Semiconductor devices

71 questions

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24

Chapter 24: The Nucleus

94 questions

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Question
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A short magnet is moved along the axis of a conducting loop. Show that the loop repels the magnet if the magnet is approaching the loop and attracts the magnet if it is going away from the loop.

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Book:

Concepts of Physics (HC Verma Part II)

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Solution Image
Consider the above situation in which a magnet is moved towards a conducting circular loop. The north pole of the magnet faces the loop. As the magnet comes closer to the loop, the magnetic field increases; hence, flux through the loop increases. According to Lenz's law, the direction of induced current is such that it opposes the magnetic field that has induced it. Thus, the induced current produces a magnetic field in the direction opposite to the original field; hence, the loop repels the magnet.
Solution Image
On the other hand, when the magnet is going away from the loop, the magnetic field decreases. Hence, flux through the loop decreases. According to Lenz's law, the induced current produces a magnetic field in the opposite direction of the original field; hence, the loop attracts the magnet.
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Practice more questions from Concepts of Physics (HC Verma Part II)

Q1
The coil of a moving-coil galvanometer keeps on oscillating for a long time if it is deflected and released. If the ends of the coil are connected together, the oscillation stops at once. Explain.
Q2
A short magnet is moved along the axis of a conducting loop. Show that the loop repels the magnet if the magnet is approaching the loop and attracts the magnet if it is going away from the loop.
Q3
Two circular loops are placed coaxially but separated by a distance. A battery is suddenly connected to one of the loops establishing a current in it. Will there be a current induced in the other loop? If yes, when does the current start and when does it end? Do the loops attract each other or do they repel?
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Question Text
A short magnet is moved along the axis of a conducting loop. Show that the loop repels the magnet if the magnet is approaching the loop and attracts the magnet if it is going away from the loop.
TopicElectromagnetic Induction
SubjectPhysics
ClassClass 12
Answer TypeText solution:1
Upvotes86