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Day 257: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. Asked once: 8 Apr 2024 (same type asked 8 times) See all 8 of this type

    106
    There are 100 divisions on the circular scale of a screw gauge of pitch 1 mm1\text{ }mm. With no measuring quantity in between the jaws, the zero of the circular scale lies 5 divisions below the reference line. The diameter of a wire is then measured using this screw gauge. It is found the 4 linear scale divisions are clearly visible while 60 divisions on circular scale coincide with the reference line. The diameter of the wire is:

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  2. Question 2

    Moving Charges and Magnetism. Asked once: 3 Apr 2025 (same type asked 8 times) See all 8 of this type

    24
    A loop ABCDA , carrying current I=12 AI = 12\text{ }A, is placed in a plane, consists of two semi-circular segments of radius R1=6π mR_{1} = 6\pi\text{ }m and R2=4π mR_{2} = 4\pi\text{ }m. The magnitude of the resultant magnetic field at center O is k×10−7 Tk \times 10^{- 7}\text{ }T. The value of k is ____\_\_\_\_ . (Given μ0=4π×10−7TmA−1\mu_{0} = 4\pi \times 10^{- 7}TmA^{- 1} )

  3. Question 3

    Moving Charges and Magnetism. Asked once: 8 Apr 2024 (same type asked 8 times) See all 8 of this type

    100
    A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a2\frac{a}{2} and 2a2a from axis of the wire is :

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  4. Question 4

    Dual Nature of Radiation and Matter. Asked once: 27 Jun 2022 (same type asked 8 times) See all 8 of this type

    13
    An α\alpha particle and a carbon 12 atom has same kinetic energy K. The ratio of their de-Broglie wavelength (λa:λC12)\left( \lambda_{a}:\lambda_{C12} \right) is:

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  5. Question 5

    Moving Charges and Magnetism. Asked once: 14 Jun 2022 (same type asked 8 times) See all 8 of this type

    19
    The magnetic field at the centre of a circular coil of radius rr, due to current I flowing through it, is B. The magnetic field at a point along the axis at a distance r2\frac{r}{2} from the centre is:

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