Current Electri...

A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes

The resistance of a conductor is 5 ohm at 50°C and6 ohm at 100°C. Its resistance at 0°C is

Equal potentials are applied on an iron and copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron)/r (copper) of their radii must be (Given that specific resistance of iron = 1.0 × 10^–7ohm–m and specific resistance of copper= 1.7 × 10^–8 ohm-m)

An electron (charge = 1.6 × 10^–19 coulomb) is moving in a circle of radius 5.1 × 10^–11m at a frequency of 6.8 × 10¹² revolutions/sec. The equivalent current isapproximately

At what temperature will the resistance of a copper wire become three times its value at 0°C (Temperature coefficient of resistance for copper = 4 ×10^–3 per ° C )?

If potential v = 100 ± 0.5 Volt and current I = 10 ± 0.2 amp are given to us, then what will be the value of resistance?

A nichrome wire 50 cm long and one square millimetre cross-section carries a current of 4A when connected to a 2V battery. The resistivity of nichrome wire in ohm metre is

If an observer is moving with respect to a stationaryelectron, then he observes

The drift velocity does not depend upon