Physics Part-I
Class 12
NCERT
1
Chapter 1: Electric Charges and Fields
47 questions
2
Chapter 2: Electrostatic Potential and Capacitance
46 questions
3
Chapter 3: Current Electricity
33 questions
4
Chapter 4: Moving Charges and Magnetism
41 questions
5
Chapter 5: Magnetism and Matter
36 questions
6
Chapter 6: Electromagnetic Induction
28 questions
Q1
Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f ).
Q2
Use Lenz’s law to determine the direction of induced current in the situations described by Fig:
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
Q3
A long solenoid with 15 turns per cm has a small loop of area placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?
View all question7
Chapter 7: Alternating Current
37 questions
8
Chapter 8: Electromagnetic Waves
20 questions
Question
Easy
Solving time: 3 mins
Use Lenz’s law to determine the direction of induced current in the situations described by Fig:
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
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Use Lenz’s law to determine the direction of induced current in the situations described by Fig:
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
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Text solution
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According to the Lenz's law, the current induced will oppose the change in flux through the loop.
(a) Since the area of loop is increasing with time, the flux through it will increase and hence the current induced will be such that its magnetic field produced is in the opposite direction.
Hence according to right hand rule, the current will be in clockwise direction
(b) Since the area of loop is decreasing with time, the flux through it will decrease and hence the current induced will be such that its magnetic field produced is in the same direction to maintain the flux right hand rule, Direction of current, - adcb
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Practice more questions from Physics Part-I (NCERT)
Q1
Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f ).
Q2
Use Lenz’s law to determine the direction of induced current in the situations described by Fig:
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
(a) A wire of irregular shape turning into a circular shape;
(b) A circular loop being deformed into a narrow straight wire.
Q3
A long solenoid with 15 turns per cm has a small loop of area placed inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?
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Practice more questions from Electromagnetic Induction
Question 1
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(c) Find the heat developed during this period.
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(e) Verify that the results in the three parts above are consistent with energy conservation.
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| Question Text | Use Lenz’s law to determine the direction of induced current in the situations described by Fig: (a) A wire of irregular shape turning into a circular shape; (b) A circular loop being deformed into a narrow straight wire. |
| Updated On | Feb 11, 2023 |
| Topic | Electromagnetic Induction |
| Subject | Physics |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 3 |
| Upvotes | 393 |
| Avg. Video Duration | 7 min |
