(Solved): A uniform aluminium wire carries a steady current at a temperature of 20C. The drift speed of th ...

A uniform aluminium wire carries a steady current at a temperature of 20°C. The drift speed of the free electrons in the wire is 0.220 mms-¹ (millimetres per second). The charge carrier density of aluminium is 6.02 x 1028 free electrons per m³ at 20°C. The current density in the aluminium wire is: a) 8.48 x 10¹1 Am² b) 5.30 x 10-€ Am-² c) 2.12 x 105 Am-² d) 2.41 x 10° Am-² e) 4.66 x 10² Am-² A parallel plate capacitor immersed in silicone oil (K = 2.50) has a plate separation of 1.50 mm and a plate area of 0.400 m². The plates are charged to a potential difference of 60.0 V. What is (i) the magnitude of the charge stored on each plate of the capacitor and (11) the energy stored in the capacitor, respectively? 60.0 V Silicone oil (k = 2.50) a) 1.04 x 10-10 C and 4.72 × 10¹8 J b) 1.42 x 10-7 C and 4.25 × 10€ J c) 3.54 x 107 C and 1.06 x 10¹5 J d) 3.54 x 10-7 C and 2.12 x 10-5 J e) 1.42 x 10-7 C and 8.50 x 10€ J Area A-0.400 m² d=1.50 mm