3. A battery has an e. m.f. of 3 V and an internal resistance of 12. What current will it give if it is connected to a circuit of
resistance:
a) 2.12
b) 4.1?
What current will it give if its terminals are short-circuited?

Agalvanometer has an internal resistance of 100 ω and deflects full-scale at 2.00 ma. what size resistor should be added to the galvanometer to convert it to a milliammeter capable of reading up to 4.00 ma, and how should this resistor be connected to the galvanometer?

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

Diamond will scratch quartz. true or false