In a meter bridge experiment, the null point divides the wire as 30 cm and 70 cm. If known resistance is 6 Ω, the unknown is:
A2.57 Ω
B6 Ω
C18 Ω
D14 Ω
Answer & Solution
Correct answer: D. 14 Ω
Meter bridge ratio: R_unknown / R_known = (100 - l)/l where l = 30 cm. So R_unknown = 6 × (70/30) = 6 × 7/3 = 14 Ω.
Related questions
The reactance of a capacitor $C$ at frequency $f$ in an a.c. circuit is:A bird perched on a single high voltage wire is unharmed because:The two conservation laws embodied in Kirchhoff's rules are conservation of:The resistance offered by the cell itself is called:Which device detects the current in a Wheatstone bridge?In a Wheatstone bridge, the source is connected across the:The Wheatstone bridge is made up of how many resistors?At a junction, the current entering equals the current: