Question

A 2-V potential difference is maintained across a 2m length wire that has a cross-section area of 8x10^-7 m². If the wire is made of material that has a resistivity of 8 × 10^–8 Ω ⋅ m, what is the current (in A) in the wire?

		45
		50
		10
		35
		27.5

Answer 1

Given,

Potential difference across wire,

Length of wire,

Cross sectional area of wire,

Resistivity of wire,

We know that,

Resistance,  

  

Now according to ohm's law,

  

Hence option C is correct