If the length of the filament of a heater is reduced by 10%, the power of the heater will

If the length of a copper wire is increased by twice, then its resistivity will be

An electric circuit is consisting of a cell, an ammeter and a nichrome wire of length l. If the length of the wire is reduced to half (I/2), then the ammeter reading

A wire of copper having length l and area of cross-section A is taken and a current I is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions a…

Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is :

Which of the following metals is used as filament in lighting bulbs?