Q.) The length of cylindrical wires is increased by 100% due to the consequent decrease in diameter , the change in resistance of the wire will be:
Q.) If a wire is stretched to make it 0.1% longer it resistance ,
(a) increased by 0.05%
(b) increased by 0.02%
(c) increased by 0.08%
(d) increased by 8%
Q.) An electric current passed through a circuit containing two wires of same material, connected in parallel.If the length of
raddi are in ration 4/3 and 2/3 .then the ratio of the current passing through the wire will be
Q.) By increasing the temperature , the specific resistance of a conductor and a semiconductor :
(a) increases for both
(b) decreses for both.
(c) increases and decreases respectively.
(d) decreases and increases respectively.
Q.) A piece of copper and another germanium are cooled from room temperature to 80K .The resistance of :
(a) copper increases and germanium decreases
(b) copper decreases and germanium increases.
(c) each of them increases.
(d) each of them decrease.