| ⇦ |
| ⇨ |
The current in a self-inductance L=40 mH is to be increased uniformly from 1A to 11A in 4 ms. The emf indued in the inductor during the process is
Options
(a) 100 V
(b) 0.4 V
(c) 40 V
(d) 440 V
Correct Answer:
100 V
Explanation:
Consider the inductor of inductance L.
The current flowing through the inductor is i.
Now, we can write ɸ = Li
where, ɸ is magnetic flux linked with the inductor dɸ / dt = L (di / dt)
Given, L = 40 mH
dt = change in time = t₂ – t₁ = 4 ms = Δi
So, dɸ / dt = Δɸ / dt = L (Δi / dt) = (40 mH) [10 /4 ms] = 10 × 10 = 100 —-(i)
According to Faraday’s law of electromagnetic induction, Emf induced, e = -(dɸ / dt)
|e| = Δɸ / dt = 100 V [from equation (i)]
Related Questions: - A vibrating string of certain length l under a tension T resonates with a mode
- The Davisson- Germer experiment is the direct evidence of
- Water flows through a pipe. The area of cross-section at one place A₁=10 cm²,
- Radioactivity of a sample at T₁ time is R₁ and at time T₂ is R₂. If half-life
- A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state
Topics: Electromagnetic Induction
(76)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A vibrating string of certain length l under a tension T resonates with a mode
- The Davisson- Germer experiment is the direct evidence of
- Water flows through a pipe. The area of cross-section at one place A₁=10 cm²,
- Radioactivity of a sample at T₁ time is R₁ and at time T₂ is R₂. If half-life
- A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state
Topics: Electromagnetic Induction (76)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends

Leave a Reply