Question

1. When the switch is closed will all the bulbs glow? Give reason.

2. Identify the underlying principle. Deduce the principle for a resistance network.

Answer 1

1. No. Since all the bulbs are identical the bridge is balanced. So potential B and C is same and no current flows through the bulb connected between B and C. So all other bulbs except R₅ will glow.

2. Four resistances P, Q, R, and S are connected as shown in figure. Voltage ‘V’ is applied in between A and C. Let I₁ , I₂ , I₃ , and I₄ be the four currents passing through P, R, Q, and S respectively.