Electric Current & Ohm's Law Mock Tests

A wire of resistance R is stretched to double its original length. Its new resistance will be:

A copper wire of resistance R is stretched so that its length increases by 50%. The new resistance will be approximately:

A wire of resistance R is stretched to double its original length. Its new resistance will be:

A wire of resistance R is cut into five equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is:

The relation between current density J, conductivity σ, and electric field E is:

In a series circuit containing three resistors R₁, R₂, and R₃ connected to a battery, the current through each resistor is:

A conductor of length L and cross-sectional area A has a potential difference V applied across it. If the length is doubled and the area is halved by stretching, the drift velocity of electrons will:

Which of the following does NOT obey Ohm's law?