physics electricity and magnetism

a) A parallel plate capacitor consists of two metal plates separated by a distance of 5.5 mm. Each plate is rectangle of size 5.0 cm x 10 cm. The space between the plates is completely filled with a kind of material. A constant voltage of 12 V is applied across the capacitor. Determine i) The capacitance of the capacitor ii) The charge stored by the fully charged capacitor b) State the formula for resistivity and describe each term c) A potential difference of 10 V is applied across the two ends of a wire of length 50 cm and diameter 3.0 mm. If the resistivity of the material of the material of the wire is 3.0 x 10'5 0m, calculate the current which flows the wire