Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5 R/4
R/5
4 R/5
5 R

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Physics
A dynamo is a device which

Converts mechanical energy into electrical energy
Creates mechanical energy
Converts electrical energy into mechanical energy
Creates electrical energy

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