The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 Volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be : |
In the circuit in Fig. 7.27, bulb B does not glow although ammeter A indicates that the current is flowing. Why does the bulb not glow? |
The bulb is fused.
There is a break in the circuit between bulb and ammeter.
The variable resistor has too large resistance.
There is a break in the circuit between the bulb and the variable resistance.
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