(i) What is dielectric?
(ii) A parallel plate capacitor consists of two plates each of area 9.6 x 10${}^{-2}$m${}^2$, separated by a dielectric of thickness 2.25 x 10${}^{-3}$ and dielectric constant 900. Calculate the capacitance of the capacitor. [ ${\epsilon }_o$ = permittivity of free space = 8.85 x 10${}^{-12}$Fm${}^{-1}$]
(b) (i) Which of the following devices has a higher resistance; an ammeter or a voltmeter? Give a reason for your answer.
(ii)

The resistance of the voltmeter in the circuit diagram illustrated above is 800$\mathrm{\Omega }$, Calculate the voltmeter reading.
(c)

A battery of negligible internal resistance is connected to a set of resistors as illustrated in the circuit diagram above. Determine the equivalent resistance of the circuit.




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