Figure shows a network of resistances connected to a 2 V battery. If the interna

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Figure shows a network of resistances connected to a 2 V battery. If the internal resistance of the battery is negligible current I in the circuit is

Figure Shows A Network Of Resistances Connected To A 2 V Bat...

Options:

A . 0.25 A

B . 0.5 A

C . 0.75 A

D . 1 A

Answer: Option B
:
B
Because

\frac{P}{Q} = \frac{R}{S}

the circuit is balanced Wheatstone's bride.Therefore potential at B =potential at D. Hence no current flows through the 5 ohm resistor. It is therefore not effectiveThe equivalent resistance between A and C is the resistance of a parallel combination of P + R = 2 + 4 = 6ohm and Q + S = 4 + 8 = 12ohm which is given by

\frac{1}{R} + \frac{1}{6} + \frac{1}{12}

R = 4ohm
Therefore current l is

l = \frac{2}{4} = 0.5

A

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