100 TUJISUIVILY.
7. How does the resistance of a wire change when:
(a) Its length is tripled & its diameter is doubled?
(b) Its material is changed to one whose resistivity is four times?
(c) Its length is quadrupled on its own.
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a) Resistance becomes 3/(2)^2 = 3÷4 times of it's original Resistance.
b) Resistance becomes 4 times of it's original Resistance.
c) Resistance becomes 16 times of it's original Resistance.
b) Resistance becomes 4 times of it's original Resistance.
c) Resistance becomes 16 times of it's original Resistance.
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