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Day 223: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. Asked once: 2021 Paper 22 (same type asked 2 times) See all 2 of this type

    7
    A coil having NN turns is wound tightly in the form of a spiral with inner and outer radii ' aa ' and 'b' respectively. Find the magnetic field at centre, when a current I passes through coil:

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  2. Question 2

    Ray Optics. Asked once: 1 Feb 2023 (same type asked 2 times) See all 2 of this type

    27
    A thin cylindrical rod of length 10 cm10\text{ }cm is placed horizontally on the principle axis of a concave mirror of focal length 20 cm20\text{ }cm. The rod is placed in a such a way that mid point of the rod is at 40 cm40\text{ }cm from the pole of mirror. The length of the image formed by the mirror will be x3 cm\frac{x}{3}\text{ }cm. The value of xx is___

  3. Question 3

    Units and Measurements. Asked once: 24 Jan 2025 (same type asked 2 times) See all 2 of this type

    22
    The least count of a screw guage is 0.01 mm . If the pitch is increased by 75%75\% and number of divisions on the circular scale is reduced by 50%50\%, the new least count will be _____\_\_\_\_\_ ×10−3 mm\times10^{- 3}\text{ }mm.

  4. Question 4

    Alternating Current. Asked once: 2021 Paper 4 (same type asked 2 times) See all 2 of this type

    17
    An LCR circuit contains resistance of 110Ω110\Omega and a supply of 220 V220\text{ }V at 300rad/s300rad/s angular frequency. If only capacitance is removed from the circuit, current lags behind the voltage by 45∘45^{\circ}. If on the other hand, only inductor is removed the current leads by 45∘45^{\circ} with the applied voltage. The rms current flowing in the circuit will be:

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  5. Question 5

    Motion in a Plane. Asked once: 21 Jan 2026 S2 (same type asked 2 times) See all 2 of this type

    18
    A large drum having radius R is spinning around its axis with angular velocity ω\omega, as shown in figure. The minimum value of ω\omega so that a body of mass M remains stuck to the inner wall of the drum, taking the coefficient of friction between the drum surface and mass M is μ\mu, is :

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