Q23.A coil of self inductance 10 mH and resistance of 0.1 Ω is connected through a switch to a battery of internal resistance 0.9 Ω . After the switch is closed, the time taken for the current to attain 80% of the saturation value is: [ln5 = 1.6] (1) 0.103 s (2) 0.002 s (3) 0.324 s (4) 0.016 s
What This Question Tests
This problem assesses the understanding of current growth in an LR circuit and the calculation of time required to reach a specific percentage of the saturation current.
Concepts Tested
Formulas Used
I(t) = I₀(1 - e^(-t/τ))
τ = L/R_total
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📋 Question Details
- Chapter
- EMI
- Topic
- LR Circuits
- Year
- 2019
- Shift
- 10 Apr Shift 2
- Q Number
- Q23
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 6: EMI
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