Question:
What back emf is induced in a coil of self-inductance 0.008 H when the current in the coil is changing at the rate of 110 A/s?
What back emf is induced in a coil of self-inductance 0.008 H when the current in the coil is changing at the rate of 110 A/s?
Show Hint
The induced back emf in a coil is proportional to the rate of change of current and the self-inductance of the coil.
Updated On: Mar 25, 2025
- 0.88V
- 0.78V
- 0.98V
- None
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
The induced emf \( \mathcal{E} \) is given by:
\[
\mathcal{E} = L \frac{dI}{dt}
\]
Where:
- \( L = 0.008 \, \text{H} \),
- \( \frac{dI}{dt} = 110 \, \text{A/s} \). Substituting the values: \[ \mathcal{E} = 0.008 \times 110 = 0.88 \, \text{V} \]
- \( L = 0.008 \, \text{H} \),
- \( \frac{dI}{dt} = 110 \, \text{A/s} \). Substituting the values: \[ \mathcal{E} = 0.008 \times 110 = 0.88 \, \text{V} \]
Was this answer helpful?
0
0
Top Questions on Electromagnetic induction
- A rectangular metallic loop is moving out of a uniform magnetic field region to a field-free region with a constant speed. When the loop is partially inside the magnetic field, the plot of the magnitude of the induced emf \( (\varepsilon) \) with time \( (t) \) is given by:
- JEE Main - 2025
- Physics
- Electromagnetic induction
- A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field \( B \) exists into the page. The bar starts to move from the vertex at time \( t = 0 \) with a constant velocity. If the induced EMF is \( E \propto t^n \), then the value of \( n \) is ________________________.
- JEE Main - 2025
- Physics
- Electromagnetic induction
- If \( B \) is magnetic field and \( \mu_0 \) is permeability of free space, then the dimensions of \( \frac{B}{\mu_0} \) is:
- JEE Main - 2025
- Physics
- Electromagnetic induction
- Consider \( I_1 \) and \( I_2 \) are the currents flowing simultaneously in two nearby coils 1 and 2, respectively. If \( L_1 \) = self-inductance of coil 1, \( M_{12} \) = mutual inductance of coil 1 with respect to coil 2, then the value of induced emf in coil 1 will be:
- JEE Main - 2025
- Physics
- Electromagnetic induction
- A coil of area \( A \) and \( N \) turns is rotating with angular velocity \( \omega \) in a uniform magnetic field \( B \) about an axis perpendicular to \( B \). Magnetic flux \( \phi \) and induced emf \( \varepsilon \) across it, at an instant when \( B \) is parallel to the plane of the coil, are:
- JEE Main - 2025
- Physics
- Electromagnetic induction
View More Questions
Questions Asked in OJEE exam
- The atoms of \(^ {6}C^{13}\) and \(^ {7}N^{14}\) are considered as:
- OJEE - 2024
- Isomerism
Complete the following nuclear equation: \( \^{30}_{15}Si + ? \rightarrow ? + 1e^0 \)
- OJEE - 2024
- Nuclear physics
The motion of a particle in the XY plane is given by \( x(t) = 25 + 6t^2 \, \text{m} \); \( y(t) = -50 - 20t + 8t^2 \, \text{m} \). The magnitude of the initial velocity of the particle, \( v_0 \), is given by:
- OJEE - 2024
- kinetic theory
- Atomicity of Phosphorus is:
- The compound which does not show a simple ratio of atoms is:
- OJEE - 2024
- Isomerism
View More Questions