Which of the following is the best method to reduce eddy currents?
- Laminating core
- Using thick wires
- Reducing hysteresis loss
- None of these
The Correct Option is A
Solution and Explanation
Top Questions on Electromagnetic induction
A conducting square loop initially lies in the $ XZ $ plane with its lower edge hinged along the $ X $-axis. Only in the region $ y \geq 0 $, there is a time dependent magnetic field pointing along the $ Z $-direction, $ \vec{B}(t) = B_0 (\cos \omega t) \hat{k} $, where $ B_0 $ is a constant. The magnetic field is zero everywhere else. At time $ t = 0 $, the loop starts rotating with constant angular speed $ \omega $ about the $ X $ axis in the clockwise direction as viewed from the $ +X $ axis (as shown in the figure). Ignoring self-inductance of the loop and gravity, which of the following plots correctly represents the induced e.m.f. ($ V $) in the loop as a function of time:
- JEE Advanced - 2025
- Physics
- Electromagnetic induction
A conducting square loop of side $ L $, mass $ M $, and resistance $ R $ is moving in the $ XY $ plane with its edges parallel to the $ X $ and $ Y $ axes. The region $ y \geq 0 $ has a uniform magnetic field, $ \vec{B} = B_0 \hat{k} $. The magnetic field is zero everywhere else. At time $ t = 0 $, the loop starts to enter the magnetic field with an initial velocity $ v_0 \hat{j} \, \text{m/s} $, as shown in the figure. Considering the quantity $ K = \frac{B_0^2 L^2}{RM} $ in appropriate units, ignoring self-inductance of the loop and gravity, which of the following statements is/are correct:
- JEE Advanced - 2025
- Physics
- Electromagnetic induction
- Electric motor converts:
- TS POLYCET - 2025
- Physics
- Electromagnetic induction
- Which law indicates this relation?
\includegraphics[width=0.5\linewidth]{75.png}- TS POLYCET - 2025
- Physics
- Electromagnetic induction
- Which of the following works on the principle of electromagnetic induction?
- TS POLYCET - 2025
- Physics
- Electromagnetic induction
Questions Asked in AIIMS exam
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : 02 is liberated in the non-cyclic photophosphorylation.
Reason (R) : Liberation of oxygen is due to photolysis of water.
In the light of the above statements, choose the correct answer from the options given below
- AIIMS - 2019
- Photosynthesis in higher plants
- Which gas is present predominantly in biogas
- AIIMS - 2019
- Aerobic Respiration
- Match the following column I with column II.
- AIIMS - 2019
- cloning
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : The Cro-Magnon man was the direct ancestor of the living modern man.
Reason (R) : Cro-Magnon man had slightly prognathous face.
In the light of the above statements, choose the correct answer from the options given below
- AIIMS - 2019
- evolution
- Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion: Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.
Reason: Orbital velocity of a satellite is greater than its escape velocity.
In the light of the above statements, choose the correct answer from the options given below- AIIMS - 2019
- Gravitation
Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter