Question

# In balanced metre bridge, the resistance of bridge wire is 0.1 $$\Omega$$/cm. Unknown resistance 'X' is connected in left gap and 6$$\Omega$$ in right gap, null point divides the wire in the ratio 2 : 3. Find the current drawn from the battery of 5V having negligible resistance.

A
1 A
B
1.5 A
C
2 A
D
5 A

Solution

## The correct option is B 1 AResistance of meter bridge =$$100\times 0.1=10\Omega$$$$\dfrac{x}{6}=\dfrac{2}{3}\rightarrow x=4\Omega$$$$\dfrac{1}{R_t}=\dfrac{1}{6+4}+\dfrac{1}{10}\rightarrow R_T=5$$$$I=\dfrac{V}{R_T}=\dfrac{5}{5}=1A$$PhysicsNCERTStandard XII

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