Question

The resistance R = `"V"/"I"`, where V = (50 ± 2) V and I = (20 ± 0.2)A. The percentage error in R is 'x' %. 

The value of x to the nearest integer is ______.

पर्याय

• 4

• 5

• 3

• 2

Answer 1

The resistance R = `"V"/"I"`, where V = (50 ± 2) V and I = (20 ± 0.2)A. The percentage error in R is 'x' %. The value of x to the nearest integer is 5.

Explanation:

We can find the % error in R by using the expression,

R = `"V"/"I"`

= `(Δ"R")/"R"xx100` = `(Δ"V")/"V"xx100 + (Δ"I")/"I"xx100`

= `2/50xx100+0.2/20xx100`

= (4 + 1) 

= 5%