Questions in Current Electricity

Select	Question
	By increasing the temperature, the specific resistance of a conductor and a semiconductor
	Which of the following is vector quantity
	Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the ratio 3 : 2 : 1. The electrical resistances are in ratio
	A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second[$e = 1.6 \times 10{–19} Coulomb$]
	The drift velocity of free electrons in a conductor is ‘v’ when a current ‘i’ is flowing in it. If both the radius and current are doubled, then drift velocity will be
	A wire of radius r has resistance R. If it is stretched to a radius of $\frac{3r}{4}$, its resistance becomes
	The resistance of a conductor increases with
	A copper wire has a square cross-section, $2.0 mm$ on a side. It carries a current of $8 A$ and the density of free electrons is $8\times 10^{28} m^{-3}$. The drift speed of electrons is equal to
	Two wires of same material have length $L$ and $2L$ and cross–sectional areas $4A$ and $A$ respectively. The ratio of their specific resistance would be
	When a current flows through a conductor its temperature