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Grade 10Electrostatics

A potentiometer consists of a wire of length 4 m and resistance 10W. It is connected to a cell of emf 2V. The potential gradient of wire is

(a) 0.5 V/m

(b) 2 V/m

(c) 5 V/m

(d) 10 V/m

Profile image of Hrishant Goswami
12 Years agoGrade 10
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2 Answers

Profile image of Aditi Chauhan
12 Years ago

(a)

Potential across wire = 2V

Length of wire = 4 m

?
Profile image of Aman
7 Years ago
As we know I max. Is E/R, 
I= E/R  = 2V/10 = 1/5 Ampere
And voltage is I max.  × Resistance ÷ Length ( which is 4m) 
V= I × R/L   =  1×10 / 20 = 0.05V/m

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