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A 2 volt battery, a 15 Omega resistor an...

A 2 volt battery, a 15 `Omega` resistor and a potentiometer of 100 cm length, all are connected in series. If the resistance of potentiometer wire is 5 `Omega`, then the potential gradient of the potentiometer wire is:

A

`0.005` V/cm

B

`0.05` V/cm

C

`0.02` V/cm

D

`0.2` V/cm

Text Solution

Verified by Experts

The correct Answer is:
A
`0.005` V/cm
Explanation

The voltage across the potentiometer ,`E = 2/(15+5) xx 5 = 10/20 = 0.5` V
Potential gradient , `K = E/l = (0.5)100 = 0.005` V/cm
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