Q14.An inductor coil stores 64 J of magnetic field energy and dissipates energy at the rate of 640 W when a current of 8 A is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit (in s). (1) 0. 4 (2) 0. 2 (3) 0. 125 (4) 0. 8
What This Question Tests
This question combines concepts of energy storage in an inductor and power dissipation in a resistor to determine the inductance and resistance, and subsequently the time constant of an RL circuit.
Concepts Tested
Formulas Used
E = (1/2)LI²
P = I²R
τ = L/R
📚 NCERT Sections This Tests
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📋 Question Details
- Chapter
- EMI
- Topic
- RL Circuits
- Year
- 2021
- Shift
- 26 Aug Shift 1
- Q Number
- Q14
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 6: Electromagnetic Induction
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