Current Electricity

Related Questions

• A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of cross-sectional (A) will lead to the smallest resistance

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• A current Iis passing through a wire having two sections P and Q of uniform diameters $d$ and $d/2$ respectively. If the mean drift velocity of electrons in sections P and Q is denoted by $v_P$ and $v_Q$ respectively, then

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• A rod of a certain metal is 1.0 m long and 0.6 cm in diameter. Its resistance is $3.0 \times 10^{-3}$ ohm. Another disc made of the same metal is 2.0 cm in diameter and 1.0 mm thick. What is the resistance between the round faces of the disc

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• A 3volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be

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• An ammeter whose resistance is $180\,\Omega $ gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is

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