# Q. If a glass rod is rubbed with silk cloth, the glass rod acquires a positive charge of 12.8 C. Calculate number of electrons transferred. Which way these electrons move. Charge on electron = 1.6 x ${10}^{-19}$ C. Q. What current flows in a resistance of 2kohm when  (i) a p.d. of 9 V and (ii) a p.d of 6 mV is applied one by one? Q. What do you mean by electric potential. Explain it by taking the analogy to liquid flow and heat flow. Q. A current of 5 mA flows through $CuS{O}_{4}$ solution for 40s. How many Cu' ' ions  will deposit  on cathode of the apparatus?

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