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Day 375: JEE Mains Physics

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

  1. Question 1

    Gravitation. Asked once: 24 Jan 2023 (same type asked 8 times) See all 8 of this type

    2
    The weight of a body at the surface of earth is 18 N18\text{ }N. The weight of the body at an altitude of 3200 km3200\text{ }km above the earth's surface is (given, radius of earth Re=6400 kmR_{e}= 6400\text{ }km ):

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  2. Question 2

    Units and Measurements. Asked once: 30 Jan 2023 (same type asked 8 times) See all 8 of this type

    27
    In a screw gauge, there are 100 divisions on the circular scale and the main scale moves by 0.5 mm0.5\text{ }mm on a complete rotation of the circular scale. The zero of circular scale lies 6 divisions below the line of graduation when two studs are brought in contact with each other. When a wire is placed between the studs, 4 linear scale divisions are clearly visible while 46th 46^{\text{th~}} division the circular scale coincide with the reference line. The diameter of the wire is_____ ×10−2 mm\times10^{- 2}\text{ }mm

  3. Question 3

    Moving Charges and Magnetism. Asked once: 27 Jan 2024 (same type asked 8 times) See all 8 of this type

    111
    The magnetic field at the centre of a wire loop formed by two semicircular wires of radii R1=2πmR_{1}= 2\pi m and R2=4πmR_{2}= 4\pi m carrying current I=4 AI = 4\text{ }A as per figure given below is α×10−7 T\alpha \times 10^{- 7}\text{ }T. The value of α\alpha is ____\_\_\_\_. (Centre OO is common for all segments)

  4. Question 4

    Moving Charges and Magnetism. Asked once: 2021 Paper 17 (same type asked 8 times) See all 8 of this type

    12
    Figure AA and BB shown two long straight wires of circular cross-section (aa and bb with a<ba < b), carrying current I which is uniformly distributed across the cross-section. The magnitude of magnetic field BB varies with radius rr and can be represented as:

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  5. Question 5

    Moving Charges and Magnetism. Asked once: 2021 Paper 3 (same type asked 8 times) See all 8 of this type

    20
    Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m0.05\text{ }m and 0.2 m0.2\text{ }m from the centre are in the ratio 8:18:1. The radius of coil is

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