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qUESTIONS

A metallic wire of resistance of 12Ω is bent to form a square. The resistance between two diagonal points would be

How many minimum number of 2Ω resistance can be connected to have an effective resistance of 1.5Ω

There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be

The lowest resistance which can be obtained by connecting10 resistors each of 1/10 ohm is

The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance

The resistance of a wire is 10Ω. Its length is increased by 10%by stretching. The new resistance will now be

The resistance of a wire of uniform diameter d and length L is R. The resistance of another wire of the same material but diameter 2d and length 4L will be

A wire of length 5m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm

The density of copper is 9×10^3 kg/m^3 and its atomic mass is 63.5u. Each copper atom provides one free electron. Estimate the number of free electrons per cubic meter in copper

A source of e.m.f. E = 15 V and having negligible internal resistance is connected to a variable resistance so that the current in the circuit increases with time as i = 1.2t+3. Then, the total charge that will flow in first five seconds will be

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