
What is the polarity induced at the ends A and B when the switch is pressed?

Answer
126.9k+ views
Hint: You can identify the polarity induced at the ends A and B in the given figure by applying right hand thumb rule. Therefore, get an idea about the right hand thumb rule and how it can be applied. So that you can identify the polarity induced at the given ends.
Complete step by step solution:
By observing the given figure, you can see the u-shaped soft iron bar AB. When the switch is kept pressed in on position, current starts flowing in the coils around the soft iron, so that the soft iron acts as an electromagnet.
We can say that there is an insulated copper wire which is wrapped on a soft iron piece. When the current is allowed through the coil, electrons flow through it. Current is passed using a battery and a key. Then the iron piece behaves and acts like a bar magnet until the current flow is stopped.
By using right hand thumb rule, we can say the polarity that is induced at the ends A and B when the switch is kept on is A is having south polarity whereas B is having north polarity.
Note: In the right hand thumb rule, we use the thumb, index and middle fingers at right angles to each other to find out the direction. The iron piece which behaves as a bar magnet when current is passed then is called an electromagnet.
Complete step by step solution:
By observing the given figure, you can see the u-shaped soft iron bar AB. When the switch is kept pressed in on position, current starts flowing in the coils around the soft iron, so that the soft iron acts as an electromagnet.
We can say that there is an insulated copper wire which is wrapped on a soft iron piece. When the current is allowed through the coil, electrons flow through it. Current is passed using a battery and a key. Then the iron piece behaves and acts like a bar magnet until the current flow is stopped.
By using right hand thumb rule, we can say the polarity that is induced at the ends A and B when the switch is kept on is A is having south polarity whereas B is having north polarity.
Note: In the right hand thumb rule, we use the thumb, index and middle fingers at right angles to each other to find out the direction. The iron piece which behaves as a bar magnet when current is passed then is called an electromagnet.
Recently Updated Pages
JEE Main 2025 - Session 2 Registration Open | Exam Dates, Answer Key, PDF

Wheatstone Bridge - Working Principle, Formula, Derivation, Application

Young's Double Slit Experiment Step by Step Derivation

JEE Main 2023 (April 8th Shift 2) Physics Question Paper with Answer Key

JEE Main 2023 (January 30th Shift 2) Maths Question Paper with Answer Key

JEE Main 2022 (July 25th Shift 2) Physics Question Paper with Answer Key

Trending doubts
JEE Main Login 2045: Step-by-Step Instructions and Details

JEE Main Exam Marking Scheme: Detailed Breakdown of Marks and Negative Marking

JEE Main 2023 January 24 Shift 2 Question Paper with Answer Keys & Solutions

JEE Main Participating Colleges 2024 - A Complete List of Top Colleges

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Degree of Dissociation and Its Formula With Solved Example for JEE

Other Pages
JEE Advanced 2025: Dates, Registration, Syllabus, Eligibility Criteria and More

Formula for number of images formed by two plane mirrors class 12 physics JEE_Main

JEE Main Course 2025: Get All the Relevant Details

Elastic Collisions in One Dimension - JEE Important Topic

JEE Main Chemistry Question Paper with Answer Keys and Solutions

Ideal and Non-Ideal Solutions Raoult's Law - JEE
