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The length oFIGURE a potentiometer wire ...

The length oFIGURE a potentiometer wire is 1200cm and it carries a current oFIGURE 60mA. FIGUREor a cell oFIGURE emFIGURE 5V and internal resistance oFIGURE `20Omega`, the null point on it is FIGUREound to be at 1000cm. The resistance oFIGURE whole wire is:

A

`80 ohm`

B

`100 ohm`

C

`120 ohm`

D

`60 ohm`

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B
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