Day 113: JEE Mains Physics

Units and Measurements. This type asked 2 times: 24 Jan 2025, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 2 of this type

Alternating Current. This type asked 2 times: 2021 Paper 4, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 2 of this type

17

The figure given below shows an LCR series circuit with two switches $S_{1}$ and $S_{2}$. When switch $S_{1}$ is closed keeping $S_{2}$ open, the phase difference $(\phi)$ between the current and source voltage is $30^{\circ}$ and phase difference is $60^{\circ}$ when $S_{2}$ is closed keeping $S_{1}$ open. The value of $\left( 3{\text{ }L}_{1}-L_{2} \right)$ is $\_\_\_\_$ H.

1. A.
   $\frac{9}{2}$
2. B.
   $\frac{2}{9}$
3. C.
   $\frac{1}{3}$
4. D.
   3

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Laws of Motion. This type asked 2 times: 21 Jan 2026 S2, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 2 of this type

Oscillations. This type asked 2 times: 2021 Paper 14, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 2 of this type

17

As shown in the figure, a spring is kept in a stretched position with some extension by holding the masses 1 kg and 0.2 kg with a separation more than spring natural length and are released. Assuming the horizontal surface to be frictionless, the angular frequency (in SI unit) of the system is :

1. A.
   30
2. B.
   27
3. C.
   20
4. D.
   5

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Units and Measurements. This type asked 2 times: 6 Apr 2024, 28 Jan 2026 S2. This one: 28 Jan 2026 S2 See all 2 of this type