Questions in Current Electricity

Select	Question
	Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be
	An electric wire is connected across a cell of e.m.f. $E$. The current $I$ is measured by an ammeter of resistance $R$. According to ohm's law
	The resistances of a wire at temperatures t°C and $0^\circ C$ are related by
	An electric wire of length ‘I’ and area of cross-section $a$ has a resistance R ohm. Another wire of the same material having same length and area of cross-section 4a has a resistance of
	For which of the following the resistance decreases on increasing the temperature
	If $n,\,e,\,\tau$ and m respectively represent the density, charge relaxation time and mass of the electron, then the resistance of a wire of length $l$ and area of cross-section $A$ will be
	The relaxation time in conductors
	Which of the following statement is correct
	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
	The resistance of a wire is $10\,\Omega $. Its length is increased by 10% by stretching. The new resistance will now be