MEDIUMNIELIT University(Govt. of India Institution) B.Tech/ M.Tech
Last Date to Apply : 15th September | Campuses in Agartala, Aizawl, Ajmer, Aurangabad, Calicut, Imphal, Itanagar, Kohima, Gorakhpur, Patna & Srinagar
Search Colleges, Exams, Schools & more
Lenz's Law - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main
Quick Facts
-
24 Questions around this concept.
Solve by difficulty
A uniform horizontal magnetic field B exists in the region A B C D. A rectangular loop of mass m and horizontal side l and resistance R is placed in the magnetic field as shown in figure. With what velocity should it be pushed down so that it continues to falls without acceleration?
A straight-line conductor of length 0.4 m is moved with a speed of perpendicular to a magnetic field of intensity
. The induced e.m.f. across the conductor is
Two identical circular loops of metal wire are lying on a table without touching each other. Loop A carries a current which increases with time. In response, the loop B :
JEE Main 2025: Sample Papers | Syllabus | Mock Tests | PYQs | Video Lectures
JEE Main 2025 Formula: Physics | Maths | Chemistry
JEE Main 2025: Preparation Guide | High Scoring Topics | Study Plan 100 Days
As shown in the figure, P and Q are two coaxial conduction loops separated by some distance. When the switch S is closed, a clockwise current flows in P (as seen by E) and an induced current
flows in Q. The switch remains closed for a long time. When S is opened, a current
flows in Q. Then the direction
and
(as seen by E) are :
A current-carrying wire is placed below a coil in its plane, with current flowing as shown. If the current increases
Two coils, A and B are as shown in the figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving.
The current in A is counter clockwise. B is kept stationary when A moves. We can infer that:
There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then:
Which of the following figure correctly depicts the Lenz’s law. The arrows show the movement of the labelled pole of a bar magnet into a closed circular loop and the arrows on the circle show the direction of the induced current
An aluminium ring B faces an electromagnet A. The current I through A can be altered:
JEE Main Exam's High Scoring Chapters and Topics
This free eBook covers JEE Main important chapters & topics to study just 40% of the syllabus and score up to 100% marks in the examination.
Download EBookA metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at t = 0 and completely emerges out at t = T sec.The current in the ring varies as:
Concepts Covered - 1
Lenz's law
Lenz's law-
This law gives the direction of induced emf /induced current.
According to Lenz's law, the direction of induced emf or current in a circuit is such as to oppose the cause that produces it.
And this law is based upon the law of conservation of energy.
- The induced current in a closed-loop circuit
1. When N pole of a bar magnet moves towards the coil the flux associated with loop increases and an emf is induced in it.
To repel the approaching north pole, the induced current is set up in the loop (if the loop is closed) in such a direction so
that the front face of the loop behaves as the north pole. Therefore induced current as seen by observer O is in an anticlockwise
direction (as shown in the figure).
2. Similarly When N pole of a bar magnet moves away from the loop as shown in the figure.
To attract the north pole, the induced current is set up in the loop (if the loop is closed) in such a direction so that the front face of the loop behaves as the south pole. Therefore induced current as seen by observer O is in a clockwise direction.
3. Similarly When S pole of a bar magnet moves towards the loop as shown in the figure.
To repel the approaching south pole, the induced current is set up in the loop (if the loop is closed) in such a direction so that the front face of the loop behaves as the south pole. Therefore induced current as seen by observer O is in a clockwise direction (as shown in the figure).
4. Similarly When S pole of a bar magnet moves away from the loop as shown in the figure.
To attract the south pole, the induced current is set up in the loop (if the loop is closed) in such a direction so that the front face of the loop behaves as the north pole. Therefore induced current as seen by observer O is in an anticlockwise direction.
- If the loop is free to move the cause of induced emf in the coil can also be termed as relative motion. Therefore to oppose the relative motion between the approaching magnet and the loop, the loop will itself start moving in the direction of motion of the magnet.
Study it with Videos
Lenz's law"Stay in the loop. Receive exam news, study resources, and expert advice!"
Get Answer to all your questions
JEE Main Articles
Sep 07, 2024
Sep 06, 2024
Sep 05, 2024
B.Tech/B.Arch Admissions OPEN
NIELIT University(Govt. of India Institution) B.Tech/ M.Tech
ApplyLast Date to Apply : 15th September | Campuses in Agartala, Aizawl, Ajmer, Aurangabad, Calicut, Imphal, Itanagar, Kohima, Gorakhpur, Patna & Srinagar
Amity University, Noida B.Tech Admissions 2024
ApplyAsia's Only University with the Highest US & UK Accreditation
ITM SLS Baroda University B.Tech Admissions 2024
ApplyApproved by UGC, PCI, & COA. Best Innovative Private Institute in Gujarat. 600+ Recruiters, 3000+ Students Placed, 1500+ Industrial Internship Opportunities, 250+ International Internships.
MIT Academy of Engineering B.Tech Admissions 2024
ApplyHighest CTC 25 LPA | Average CTC 5.54 LPA | 280+ Recruiters
Plastindia International University B.Tech Admissions 2024
ApplyInternational Learning Opportunities | UGC Approved | State-of-the-Art Laboratories
Joy University B.Tech 2024
ApplyOutstanding faculty of Eminence from IIT, BITS, IIM, IIIT NIT, NID and faculty from foreign universities | Merit & sports based scholarship
News and Notifications
September 03, 2024 - 07:24 PM IST
August 12, 2024 - 11:27 AM IST
July 10, 2024 - 07:26 PM IST
June 20, 2024 - 12:07 PM IST
June 16, 2024 - 03:31 PM IST
May 02, 2024 - 10:31 AM IST
May 01, 2024 - 08:44 AM IST
Download Careers360 App's
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile
300M+
Students
36,000+
Colleges
550+
Exams
1500+
E-Books
16000+
Certifications
We Appeared in
Back to top