Wed September 28, 2011 By: Anupam Neelima
In an experiment to stuydy dependence of current on the potential difference across a given resistor, four students P,Q, R and S kept the plug key in the circuit closed for time t1 and then open for time t2 as given in the table below:

Dependence of current on the potential difference

Expert Reply
Thu September 29, 2011
Correct Option: (a)
We must keep the circuit closed for a relatively shorter time and open for a relatively longer time. This would ensure minimal changes in the values of resistances due to the heating effects of currents.
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