Question Answers

Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A and B are two identical bulbs of 40W connected to a V=12 volt cell. Switch S is closed to connect a third bulb C in the circuit. What happens to brightness of bulb A? Answer for two cases: (i) Bulb C is a very high wattage bulb. (ii) Bulb C is a very low wattage bulb. All the three bulbs have rated voltage of 12 volt.

A and B are two identical bulbs of 40W connected to a V=12 volt cell. Switch S is closed to connect a third bulb C in the circuit. What happens to brightness of bulb A? Answer for two cases: (i) Bulb C is a very high wattage bulb. (ii) Bulb C is a very low wattage bulb. All the three bulbs have rated voltage of 12 volt.

A bulb B is connected to a source having constant emf and some internal resistance. A variable resistance R is connected in parallel to the bulb. If the resistance R is increased how will it affect the- (a) Brightness of the bulb? (b) Power spent by the source ?