Q15.The time taken for the magnetic energy to reach 25% of its maximum value, when a solenoid of resistance R, inductance L is connected to a battery, is : (1) L ln5 (2) infinite R (3) R L ln2 (4) RL ln10
What This Question Tests
This question requires determining the time taken for the magnetic energy stored in an RL circuit to reach 25% of its maximum value using the current growth formula.
Concepts Tested
Formulas Used
I(t) = I₀(1 - e^(-Rt/L))
U_B = (1/2)LI²
📚 NCERT Sections This Tests
3.1 — The Storage Battery Of A Car Has An Emf Of 12 V. If The Internal
Physics Class 11 · Chapter 3
3.1 The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery?
3.2 — A Battery Of Emf 10 V And Internal Resistance 3 Ω Is Connected To A
Physics Class 11 · Chapter 3
3.2 A battery of emf 10 V and internal resistance 3 Ω is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistor? What is the terminal voltage of the battery when the circuit is closed?
4.8 — A Closely Wound Solenoid 80 Cm Long Has 5 Layers Of Windings Of 400
Physics Class 11 · Chapter 4
4.8 A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, estimate the magnitude of B inside the solenoid near its centre.
📋 Question Details
- Chapter
- EMI
- Topic
- RL circuits
- Year
- 2021
- Shift
- 18 Mar Shift 2
- Q Number
- Q15
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 6: Electromagnetic Induction
More from this Chapter
Q56.A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B constant in time and space, pointing perpendicular and into the plane at the loop exists everywhere with half the loop outside the field, as shown in figure. The induced emf is (1) zero (2) RvB (3) VBL/R (4) VBL
Q57. The inductance between A and D is (1) 3.66 H (2) 9 H (3) 0.66 H (4) 1 H JEE Main 2002 JEE Main Previous Year Paper
Q59.Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon (1) the rates at which currents are changing in the (2) relative position and orientation of the two coils two coils (3) the materials of the wires of the coils. (4) the currents in the two coils
Q60.When the current changes from +2 A to −2 A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is (1) 0.2H (2) 0.4H (3) 0.8H (4) 0.1H