Current Electricity

What are superconductors ? [AI 2003]

Name the physical quantity which has joule
coulomb"' as its unit. Is it a scalar or a vector
quantity ?

You are asked to measure emf of a cell. Which
instrument will you use

How does the drift velocity of electrons in a
metallic conductor vary with increase in
temperature ? [Delhi 2002]

If a wire of resistivity 'p' is stretched to thrice
its initial length, what will be its new
resistivity ?

Nichrome and copper wires of the same length
and same radius are connected in series. Current
I is passed through them. Why does the
nichrome wire get heated first ? [AI 2001C]