The diagram above shows a balanced metre bridge, the value of x is
-
A.
75.0 cm -
B.
66.7 cm -
C.
33.3 cm -
D.
25.0 cm
Correct Answer: Option C
Explanation
1/R = 1/8 + 1/8 = 2/8
∴ R = 4Ωl/l1 = R/R1
(x)/(100-x) = 4/8
4(100-x) = 8x
400-4x = 8x
400 = 8x + 4x = 12x
x = 400/12 = 33.3cm