A circuit contains an ammeter, a battery of 30 v and a resistance 40.8 ohm all connected in series. If the ammeter has coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be:

A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in It ______________.
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For the given mixed combination of resistors calculate total resistance between points A and B.

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A cell of emf 1.1 and internal resistance 0.5 Ω is connected to a wire of resistance 0.5 Ω. Another cell of the same emf is now connected in series with the intention of increasing the current but the current in the wire remains the same. The internal resistance of the second cell is __________.
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P, Q, R and S are four wires of resistances 3, 3, 3 and 4 Ω respectively. They are connected to form the four arms of a wheat-stone bridge circuit. The resistance with which S must be shunted in order that the bridge may be balanced is __________.
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