The earth wire is made of ................ (plastic/copper).

Complete the following sentences : A fuse wire is made of an alloy of ................... If the current in a circuit exceeds the current rating of the fuse wire, it ................

The wire of flash bulb is made of :

Electrodes made of copper, nickel, silver are known as ................. electrodes.

In figure the upper wire is made of steel and the lower of copper. The wires have equal cross section. Find the ratio of the longitudinal strains developed in the two wires.

The wire of potentiometer is made of

The earth wire is normally connected to the metal casings present in the appliances

Copper wire test is called

The parts of electrical objects that need to let electricity pass through are always made of metal, whereas the plastic covering that surrounds wires is an electrical insulator. Give reason.

During electrorefining of copper, a pure copper is made the ............

A homogeneous block with a mass m hangs on three vertical wires of equal length arranged symmetrically . Find the tensions of the wires if the middle wire is of steel and the other two are of copper . All the wires have the same cross - section . Consider the modulus of elasticity of steel to be double than that of copper .