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Day 129: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Alternating Current. This type asked 2 times: 29 Jan 2024, 31 Jan 2024. This one: 31 Jan 2024 See all 2 of this type

    95
    An AC voltage V=20sin⁡200πtV = 20\sin200\pi t is applied to a series LCR circuit which drives a current I=10sin⁡(200πt+π3)I = 10\sin\left( 200\pi t +\frac{\pi}{3} \right). The average power dissipated is:

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  2. Question 2

    Current Electricity. This type asked 2 times: 27 Jul 2022, 31 Jan 2024. This one: 31 Jan 2024 See all 2 of this type

    99
    The resistance per centimeter of a meter bridge wire is rr, with XΩX\Omega resistance in left gap. Balancing length from left end is at 40 cm40\text{ }cm with 25Ω25\Omega resistance in right gap. Now the wire is replaced by another wire of 2r2r resistance per centimeter. The new balancing length for same settings will be at

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  3. Question 3

    Electrostatics. This type asked 2 times: 24 Jan 2023, 31 Jan 2024. This one: 31 Jan 2024 See all 2 of this type

    94
    Force between two point charges q1q_{1} and q2q_{2} placed in vacuum at 'r' cm apart is F. Force between them when placed in a medium having dielectric K=5K = 5 at ' r/5r/5 ' cmcm apart will be:

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  4. Question 4

    Laws of Motion. This type asked 2 times: 25 Jan 2023, 31 Jan 2024. This one: 31 Jan 2024 See all 2 of this type

    102
    A block of mass 5 kg5\text{ }kg is placed on a rough inclined surface as shown in the figure. If F→1{\overrightarrow{F}}_{1} is the force required to just move the block up the inclined plane and F→2{\overrightarrow{F}}_{2} is the force required to just prevent the block from sliding down, then the value of ∣F→1∣−∣F→2∣\left| {\overrightarrow{F}}_{1} \right|-\left| {\overrightarrow{F}}_{2} \right| is: [Use  g=10 m/s2]\left. \ g = 10\text{ }m/s^{2} \right\rbrack

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  5. Question 5

    Motion in a Plane. This type asked 2 times: 25 Jun 2022, 31 Jan 2024. This one: 31 Jan 2024 See all 2 of this type

    17
    A coin is placed on a disc. The coefficient of friction between the coin and the disc is μ\mu. If the distance of the coin from the center of the disc is rr, the maximum angular velocity which can be given to the disc, so that the coin does not slip away, is :

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