A thin hollow copper pipe carries direct current than which is incorrect
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    An electron moving in a circular orbit of radius $r$ makes $n$ rotations per second. The magnetic field produced at the centre has magnitude
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  • 2
    A galvanometer of $100\,\Omega $ resistance gives full scale deflection when $10\, mA$ of current is passed. To convert it into $10\, A$ range ammeter, the resistance of the shunt required will be ............... $\Omega $
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  • 3
    A galvanometer of resistance $100 \Omega$ when connected in series with $400 \Omega$ measures a voltage of upto $10 \mathrm{~V}$. The value of resistance required to convert the galvanometer into ammeter to read upto $10 \mathrm{~A}$ is $\mathrm{x} \times 10^{-2} \Omega$. The value of $\mathrm{x}$ is :
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  • 4
    A galvanometer of resistance $G$ is converted into a voltmeter of range $0-1\, V$ by connecting a resistance $R _{1}$ in series with it. The additional resistance that should be connected in series with $R _{1}$ to increase the range of the voltmeter to $0-2\, V$ will be
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  • 5
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  • 6
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  • 7
    Given below are two statements

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  • 8
    If the angular momentum of an electron is $\vec J$ then the magnitude of the magnetic moment will be
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