Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?
If negative charges are induced on an electroscope and a positively charged rod is brought near the cap of the electroscope, the leaves will?
Which of the following can conduct electricity owing to the presence of free mobile electrons?
When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will?
Transistors are used for the?
