The potentiometer is best for measuring voltage, as
AIPMT 2000, Medium
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  • 1
    The current in a conductor varies with time t as $I = 2t + 3{t^2}$ where $I$ is in ampere and $t$ in seconds. Electric charge flowing through a section of the conductor during $t = 2\,\sec$ to $t = 3\,\sec$ is ............. $C$
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  • 2
    The charge of an electron is $1.6 × 10^{-19}\,C$. How many electrons strike the screen of a cathode ray tube each second when the beam current is $16\,mA$
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  • 3
    The effective resistance between $A$ and $B$, if resistance of each resistor is $R$, will be
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  • 4
    The equivalent resistance between points $A$ and $B$ in the given network is ............ $\Omega$
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  • 5
    Equivalent resistance between $A$ and $B$ is ............ $\Omega$
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  • 6
    The resistance of an electrical toaster has a temperature dependence given by $R\left( T \right) = {R_0}\left[ {1 + \alpha \left( {T - {T_0}} \right)} \right]$ in its range of operation. At ${T_0} = 300\,K,R = 100\,\Omega $ and at $T = 500\,K,\,R = 120\,\Omega $. The toaster is connected to a voltage source at $200\, V$ and its temperature is raised at a constant rate from $300$ to $500\, K$ in $30\, s$. The total work done in raising the temperature is
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  • 7
    Consider the circuit given here with the following parameters $E.M.F.$ of the cell = $12\, V$. Internal resistance of the cell $ = 2\,\Omega $. Resistance $R = 4\,\Omega $ Which one of the following statements in true
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  • 8
    The number of dry cells, each of $e.m.f.$ $1.5\,volt$ and internal resistance $0.5\, ohm$ that must be joined in series with a resistance of $20\, ohm$ so as to send a current of $0.6\,A$ through the circuit is
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  • 9
    A capacitor is connected to a cell of $emf$ $E$ having some internal resistance $r$. The potential difference across the
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  • 10
    Which among the following is true
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