Physics Practice Tests – Current Electricity and Electric Charges


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A wire of resistivity 4.40 x 10-5 Ω cm has a cross sectional area of 7.50 x 10-4  cm-2. Calculate the length of this wire that will be required to make a 4.0 Ω resistor.

A. 82.50 cm   B. 68.18 cm    C. 15.90 cm    D. 11.94 cm


Two capacitors of capacitance 0.4 μF and 0.5 μF are connected in parallel and charged to a p.d. of 50V. Determine the total charge acquired.

A. 45μC     B. 25μC     C. 20μC     D. 10μC


The equivalent capacitance of a 3μF capacitor and a 6 μF capacitor connected in parallel is ______

A. 2.0 μF     B. 3.0 μF     C. 4.5 μF     D. 9.0μF


Find the cost of running a 60 W lamp for 24 hours, if 1 kWhr costs 5 naira.

A. 14.4 naira    B. 12.5 naira    C. 7.2 naira    D. 2.0 naira


The quantity of electric charge stored in a capacitor is measured in ______

A. farad    B. ampere    C. coulomb    D. volt


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