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Day 303: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. Asked once: 15 Apr 2023 (same type asked 3 times) See all 3 of this type

    7
    For designing a voltmeter of range 50 V50\text{ }V and an ammeter of range 10 mA10\text{ }mA using a galvanometer which has a coil of resistance 54Ω54\Omega showing a full-scale deflection for 1 mA1\text{ }mA as in figure. (A) for voltmeter R≈50kΩR \approx 50k\Omega (B) for ammeter r≈0.2Ωr \approx 0.2\Omega (C) for ammeter r≈6Ωr \approx 6\Omega (D) for voltmeter R≈5kΩR \approx 5k\Omega (E) for voltmeter R≈500ΩR \approx 500\Omega Choose the correct answer from the options given below:

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  2. Question 2

    Work, Energy and Power. Asked once: 1 Feb 2023 (same type asked 3 times) See all 3 of this type

    21
    A small particle moves to position 5ı^−2ȷ^+k^5\widehat{\imath}- 2\widehat{\jmath}+\widehat{k} from its initial position 2ı^+3ȷ^−4k^2\widehat{\imath}+ 3\widehat{\jmath}- 4\widehat{k} under the action of force 5ı^+2ȷ^+7k^ N5\widehat{\imath}+ 2\widehat{\jmath}+ 7\widehat{k}\text{ }N. The value of work done will be ___J.

  3. Question 3

    Electrostatics. Asked once: 2021 Paper 9 (same type asked 3 times) See all 3 of this type

    1
    An oil drop of radius 2 mm2\text{ }mm with a density 3 g3\text{ }g cm−3cm^{- 3} is held stationary under a constant electric field 3.55×105 V m−13.55 \times10^{5}\text{ }V{\text{ }m}^{- 1} in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess? (consider g=9.81 m/s2g = 9.81\text{ }m/s^{2} )

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  4. Question 4

    System of Particles and Rotational Motion. Asked once: 28 Jun 2022 (same type asked 3 times) See all 3 of this type

    92
    A ball is spun with angular acceleration α=6t2−2t\alpha = 6t^{2}- 2t where tt is in second and α\alpha is in rads−2rads^{- 2}. At t=0t = 0, the ball has angular velocity of 10 rads−1rads^{- 1} and angular position of 4rad4rad. The most appropriate expression for the angular position of the ball is:

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 2021 Paper 26 (same type asked 3 times) See all 3 of this type

    3
    A cord is wound round the circumference of wheel of radius rr. The axis of the wheel is horizontal and the moment of inertia about it is I. A weight mgmg is attached to the cord at the end. The weight falls from rest. After falling through a distance ' hh ', the square of angular velocity of wheel will be:

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