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Day 411: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 26 Jul 2022 (same type asked 11 times) See all 11 of this type

    6
    The magnetic field of a plane electromagnetic wave is given by
    B→=2×10−8sin⁡(0.5×103x+1.5×1011t)j^T\overrightarrow{B}= 2 \times10^{- 8}\sin\left( 0.5 \times10^{3}x + 1.5 \times10^{11}t \right)\widehat{j}T
    The amplitude of the electric field would be

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  2. Question 2

    Units and Measurements. Asked once: 27 Jul 2022 (same type asked 10 times) See all 10 of this type

    1
    A torque meter is calibrated to reference standards of mass, length and time each with 5%5\% accuracy. After calibration, the measured torque with this torque meter will have net accuracy of:

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  3. Question 3

    Alternating Current. Asked once: 29 Jun 2022 (same type asked 10 times) See all 10 of this type

    120
    An inductor of 0.5mH0.5mH, a capacitor of 200μF200\mu F and a resistor of 2Ω2\Omega are connected in series with a 220 V220\text{ }V ac source. If the current is in phase with the emf, the frequency of ac source will be _×102 Hz\_ \times10^{2}\text{ }Hz.

  4. Question 4

    Mechanical Properties of Fluids. Asked once: 31 Jan 2023 (same type asked 10 times) See all 10 of this type

    9
    If 1000 droplets of water of surface tension 0.07 N/m0.07\text{ }N/m, having same radius 1 mm1\text{ }mm each, combine to form a single drop. In the process the released surface energy is- (Take π=227\pi =\frac{22}{7} )

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  5. Question 5

    Electromagnetic Waves. Asked once: 4 Apr 2024 (same type asked 10 times) See all 10 of this type

    2
    The electric field in an electromagnetic wave is given by E→=i^40cos⁡ω(t−zc)NC−1\overrightarrow{E}=\widehat{i}40\cos\omega\left( t -\frac{z}{c} \right)NC^{- 1}. The magnetic field induction of this wave is (in SI unit):

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