A square aluminium plate of thickness and density has a mass of

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A square aluminium plate of thickness

0.50\,\text{mm}

and density

2.7\,\text{g}\,\text{cm}^{-3}

has a mass of

5.4\,\text{g}

. An identical plate is made from the same sheet. The two plates are arranged as a parallel-plate capacitor in air with a separation of

2.0\,\text{mm}

. Neglecting edge effects, determine the capacitance of the capacitor. (a)

1.8\,\text{pF}

(b)

35\,\text{pF}

(c)

18\,\text{pF}

(d)

180\,\text{pF}