Question

A copper wire has a diameter 0.5 mm and resistivity 1.6 x 10-8 ohm m.
(i) What will be the length of this wire to make the resistance of 12 Ohm
ii) How much will be the resistance of another copper wire of same length but half the diameter?

Answer 1

Answer:

The new resistance is 2.5 ohm.          

Explanation:

Given that,

Diameter d = 0.5 mm

Resistivity  

Resistance R = 10 ohm

We know that,

The resistance of the wire is

....(I)

If the diameter is double then,

The new resistance is

.....(II)

Divide equation (II) by equation (I)

Hence, The new resistance is 2.5 ohm.    

Explanation:

Answer 2

Answer:

2.5ohm

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