A conductor of resistivity 100 x 108 Ohm meter is connected in the circuit. If the length of the conductor is 10 meter and area of cross section is 1 mm2 (a) calculate the resistance offered by the conductor. (b) How does its resistance change if its length is halved and area of cross section is doubled. (c) What happens to its resistance if the temperature of the conductor is increased? Why? (d) If this conductor is remoulded such that its length is halved what will be its resistance?

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The resistance of a wire is 24 ohm. What will be the new resistance if

(a) only the length of the conductor is increased to 3 times of its original length.

(b) only the cross section area of the wire is doubled?

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