Question

The resistance of a conductor wire is 10 m Ohm. If a potential of 100 V is applied across its ends, find the value of current passing through it in mA.
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Answer 1

Answer:

Hence R = 22.5/10 = 2.25 Ohms per km.

Length of conductor = 500m =500/1000 = 0.5km.

Therefore resistance of copper conductor = 2.25 x 0.5 =1.125 Ohms. Similarly for Aluminium, The resistance per km for Aluminium is given by:

R = 36/S(c.s.a)

Again S = 10mmsq.

Hence R = 36/10 = 3.6 Ohms per km.

Length of conductor = 0.5km

Answer 2

Answer:

Current, I=  0.01 mA

Explanation:

Resistance,R = 10M ohms

                     = 10x 10^6 ohms

Voltage,V= 100 V

V=IR

I=V/R

I=100/10^7

= 10^-5A

1A= 10^3mA

therefore I= 0.01mA