1. An electric charge of 15C passes through the cross section of a wire in one minute. Find the current through the wire. [Ans]

2. If 15J of work is done when a charge of 3C is moved from one point to another, find the electric potential difference between the two points. [Ans]

3. A wire carries a current of 0.2 A for 10 seconds. If the potential difference between the two ends of the wire is 20 V, find the work done in this process. [Ans]

4. Calculate the potential difference across a 10 Ω resistor carrying a current of 0.2 A. [Ans]

5. The resistance of a wire of length 31.4 m and diameter 1 mm is 20 Ω . Find the resistivity of the material of the wire. [Ans]

6. If the resistance of wire A is four times the resistance of wire B, find the ratio of their cross sectional areas.

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8. If two resistors are connected in series, the total resistance is 45 Ω and if the same resistors are connected in parallel, the total resistance becomes 10 Ω . Find the values of individual resistors. Solution: Data : Rs = 45Ω , Rp = 10Ω , R1 = ? , R2 = ?

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9. Find the effective resistance of the combination of two resistors of resistances 10 Ω and 15 Ω connected in (i) Series (ii) Parallel.