Proven Strategies to Excel in JEE Main Mock Tests on Electromagnetic Induction & Alternating Currents
Electromagnetic Induction and Alternating Currents is a pivotal chapter in JEE Physics, exploring concepts like Faraday’s and Lenz’s Laws, eddy currents, transformers, and AC circuits. Excelling in this chapter strengthens your grip on both theory and numericals relevant to the JEE Main exam. Take this mock test now to reinforce your understanding and crack challenging problems with confidence!
Mock Test Instructions for the Electromagnetic Induction And Alternating Currents Mock Test-3:
- 20 questions from Electromagnetic Induction And Alternating Currents
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Help You Master Electromagnetic Induction And Alternating Currents?
- Apply Faraday’s and Lenz’s Laws directly to challenging MCQs.
- Enhance problem-solving speed for time-bound JEE Main exams.
- Regular practice identifies misconceptions in induced emf and transformer questions.
- Improve accuracy on calculation-based alternators and rms value questions.
- Track your preparation level and address weak zones using instant mock test feedback.
Increase Your JEE Score: Expert-Designed Tests on Electromagnetic Induction & AC Circuits
- Gain conceptual clarity on mutual/self-induction and transformer theory.
- Solve previous year-pattern problems for real exam readiness.
- Refine calculations involving phase difference, impedance, and LC oscillations.
- Mock tests enable focused revision on scoring subtopics like eddy currents and AC formulas.
- Learn time management strategies for numerical-heavy Physics sections.
Subject-Wise Excellence: JEE Main Mock Test Links
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| 1 | Online FREE Mock Test for JEE Main Chemistry |
| 2 | Online FREE Mock Test for JEE Main Maths |
| 3 | Online FREE Mock Test for JEE Main Physics |
Important Study Materials Links for JEE Exams
FAQs on Electromagnetic Induction and Alternating Currents: JEE Main Mock Test Preparation 2025-26
1. What is electromagnetic induction?
Electromagnetic induction is the process by which a changing magnetic field induces an electric current or emf in a conductor. This principle was first discovered by Michael Faraday, and it is the basis for many devices like generators and transformers.
2. State Faraday’s laws of electromagnetic induction.
Faraday's first law states that whenever the magnetic flux linked with a closed circuit changes, an emf is induced in it. Faraday's second law states that the induced emf is directly proportional to the rate of change of magnetic flux through the circuit.
3. What factors affect the magnitude of the induced emf?
The magnitude of the induced emf depends on:
• The rate of change of magnetic flux
• The number of turns in the coil
• The strength of the magnetic field
• The area of the coil exposed to the magnetic field
• The angle between the magnetic field and the normal to the coil
4. What is Lenz’s law and how does it relate to electromagnetic induction?
Lenz's law states that the direction of the induced emf and current in a circuit will be such that it opposes the change in magnetic flux that produced it. This law ensures the conservation of energy in electromagnetic induction processes.
5. How is alternating current (AC) generated?
Alternating current (AC) is generated when a coil rotates in a uniform magnetic field, causing the magnetic flux through the coil to change continuously with time. This induces an alternating emf in the coil according to Faraday's law.
6. What is the difference between self-induction and mutual induction?
Self-induction is the phenomenon in which a changing current in a coil induces an emf in the same coil. Mutual induction occurs when a changing current in one coil induces an emf in a nearby coil. Both effects are important in transformers and electrical circuits.
7. What is the function of a transformer and how does it work?
A transformer is an electrical device that uses the principle of mutual induction to increase (step-up) or decrease (step-down) the AC voltage in a circuit. It consists of primary and secondary coils wound on a common iron core, and changes in the primary current induce an emf in the secondary coil.
8. What is the significance of eddy currents?
Eddy currents are loops of induced current produced in conductors when exposed to a changing magnetic field. While they can cause energy losses (heating), they are also useful in devices like induction cooktops and electromagnetic brakes. Lamination of cores is used to reduce unwanted eddy currents in transformers.
9. How can electromagnetic induction be demonstrated using a coil and magnet?
Electromagnetic induction can be demonstrated by moving a magnet toward or away from a coil of wire connected to a sensitive galvanometer. The deflection of the galvanometer needle indicates the presence and direction of the induced current.
10. What is an application of electromagnetic induction in daily life?
Electromagnetic induction is used in various devices such as electric generators, transformers, induction cooktops, credit card sensors, and wireless charging pads. These applications rely on the induction of emf and current by changing magnetic fields.
11. How is root mean square (RMS) value of AC calculated?
The root mean square (RMS) value of an alternating current is calculated as:
Irms = I0 / √2,
where I0 is the maximum value of the current. The RMS value gives the equivalent direct current value that would produce the same heating effect in a resistor.
12. What is the role of slip rings in an AC generator?
In an AC generator, slip rings are used to connect the rotating coil to the external circuit. They allow the coil to rotate freely while maintaining an electrical connection, thus enabling the continuous generation of alternating current.
