Question

how does the resistance of a wire change when :

a) its length is tripled

b)its diameter is tripled

c)its material is changed to one whose resistivity is three times?

Answer 1

Answer:

a) The resistance of a wire is directly proportional to its length and inversely proportional to its area therefore

when the length is tripled then it's resistance will become three times

if the material is changed to one whose resistivity is three times then again it's resistance will be three times

b) if the resistance of an wire is tripled, resistance will become 3 times

c) it's material is changed to one whose resistivity is three times thats it the resistance will decrease nine times of initial.