Metals are good conductor of electricity because____
metals have large number of free electrons `square`
metals have many protons.`square`
None Of These `square`

Why are the alkali metals good conductor of electricity?

An atom is usually electrically neutral because_____ equal number of electron proton square equal number of neutron electron square equal number of neutron proton square none of these square

Which is a good conductor of heat: a metal or a non metal?

In metallic conductor of conventional current is____ to the direction of flow of free electrons [Fill in the blanks]

Boron is a non-metal and a bad conductor of electricity while aluminium is a metal and a good conductor of electricity. Explain.

A semi conductor material is_____ silicon square glass square copper square none of the above. square

Ion conducts electricity in metallic conductor. (True/False)

Velocity of electric current is much more___ than the drift velocity of free electrons in a metallic conductor [Fill in the blanks].

Account for the following : Transition metals form a large number of complex compounds.

If a current passes through a metal conducting wire of area of cross section A, the drift velocity of free electrons inside the metal is v_d=1/( n e A) , where the amount of electric charge of an electron =e and the number of free electrons per unit volume of the metal=n. The applied electric field on the wire is E=V/l , where a potential difference V exists between two points, l apart, along the length of the wire. IF R is the resistance of the wire between those two points, then the resistivity of its material is rho=(RA)/l .Besides the mobility (mu) of the free electrons inside a wire is defined as their drift velocity for a unit applied electric field. Two copper wires have both lengths and radii in the ratio 1:2 if the ratio between the electric currents flowing through them is also 1:2 , what would be the ratio between the drift velocities of free electrons?