Question

In the metre Bridge shown, the resistance X has a negative temperature coefficient of resistance. Neglecting the variation in other resistors, when current is passed for sometime, in the circuit, balance should shift towards ?

• A. A
• B. B
• C. first A then B
• D. it will remain at C

Answer 1

The correct option is B B

According to meter balance condition

$\frac{R}{X}=\frac{AC}{CB}$

As given resistance $X$ has negative temperature coefficient therefore, resistance of $X$ will decreases if resistances will decrease than to maintain balance condition ,galvanometer will shift towards B.

Hence, option(B) is correct option.