Question

please solve question no. 28

Answer 1

Let Resistance of broken wire was = R
and resistance of one wire given by Q is 2 ohm
both wire are connected In parallel .
we know,
1/R1 + 1/R2 = 1/Req

(R1 + R2)/R1.R2 = 1/Req

Req = R1.R2/(R1 + R2)

put R1 = R
R2 = 2 ohm
Req = 6/5 ohm

6/5 = 2R/( R +2)

6R + 12 = 10R

4R = 12

R = 3

hence, resistance of broken wire = 3 ohm