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Questions and Answers
When the current in a coil changes from 2 A to 4 A in 0.05 s, an emf of 8 V is induced in the coil. The coefficient of self-induction of the coil is:
When the current in a coil changes from 2 A to 4 A in 0.05 s, an emf of 8 V is induced in the coil. The coefficient of self-induction of the coil is:
- 0.4 H
- 0.2 H
- 0.1 H
- 0.8 H (correct)
An emf of 15 V is applied in a circuit containing 5 H inductance and 10 $\Omega$ resistance. The ratio of the currents at time t = $\infty$ and at t = 1 s is:
An emf of 15 V is applied in a circuit containing 5 H inductance and 10 $\Omega$ resistance. The ratio of the currents at time t = $\infty$ and at t = 1 s is:
- e^2
- 1 / (e^1/2 - 1)
- e^1/2 - 1
- e^1/2 / (e^1/2 - 1) (correct)
- e^1/2
Flashcards
Self-induction coefficient
Self-induction coefficient
The property of a coil that opposes a change in current flowing through it.
Inductive Circuit with Resistance
Inductive Circuit with Resistance
A circuit containing inductance and resistance, where current changes over time.
Study Notes
Self-Induction Problem
- A change in current (2A to 4A) in a coil over 0.05 seconds induces an emf of 8V
- The coil's self-inductance is 0.8H
RL Circuit Problem
- An emf of 15V is applied to a circuit with 5H inductance and 10Ω resistance
- The ratio of currents at t = ∞ and t = 1s is e1/2 / (e1/2 - 1) or approximately 1.65
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