Question:
A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if
A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if
Updated On: Dec 25, 2023
- it is rotated about its axis
- it is rotated about a diameter
- it is not moved
- it is given translational motion in the field
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
An emf is induced only when magnetic flux linked with the loop changes. This is possible when the loop is rotated about a diameter
Was this answer helpful?
1
0
Top Questions on Electromagnetic induction
- The current through an inductor is uniformly increased from zero to 2 A in 40 s. An emf of 5 mV is induced during this period. Find the flux linked with the inductor at t = 10 s.
- CBSE CLASS XII - 2025
- Physics
- Electromagnetic induction
- The magnetic flux linked with a coil changes with time \( t \) as \( \phi = (8t^2 + 5t + 7) \), where \( t \) is in seconds and \( \phi \) is in Wb. The value of emf induced in the coil at \( t = 4 \) s is:
- CBSE CLASS XII - 2025
- Physics
- Electromagnetic induction
An ideal transformer is designed to convert 50 V into 250 V. It draws 200 W power from an AC source whose instantaneous voltage is given by \( v_i = 20 \sin(100\pi t) \, \text{V} \).
Find:
- 1. RMS value of input current.
- 2. Expression for instantaneous output voltage.
- 3. Expression for instantaneous output current.
- CBSE CLASS XII - 2025
- Physics
- Electromagnetic induction
- Write the principle of working of a transformer. With the help of a labelled diagram, explain the working of a step-up transformer.
- CBSE CLASS XII - 2025
- Physics
- Electromagnetic induction
- State Lenz’s law. A rod MN of length \( L \) is rotated about an axis passing through its end M perpendicular to its length, with a constant angular velocity \( \omega \) in a uniform magnetic field \( \vec{B} \) parallel to the axis. Obtain an expression for emf induced between its ends.
- CBSE CLASS XII - 2025
- Physics
- Electromagnetic induction
View More Questions
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