Question

A student plots V-I graphs of 3 samples of nichrome wire with resistance R1, R2, R3. select the true statement.​

Answer 1

option D

Explanation:

v=IR

R=V/I

if graph be v and I is given resistance directly proportional to slope but in question graph bw I and V are given So it is inversely proportional to slope

Answer 2

$R_2>R_1>R_3$

Explanation:

From the Ohm's law we have the mathematical expression:

$V=R.I$

$I=\frac{1}{R} \times V$ ..............(1)

On comparing the above equation with the standard form of line:

$y=m.x+c$

where:

$m=$ slope of the line

$c=$ intercept on y-axis

we get slope as:

$m=\frac{1}{R}$

Hence: $R_2>R_1>R_3$

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TOPIC: Ohm's law

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