Question

1. A parallel plate capacitor has a plate area of 0.005 m² and a separation between the plates of 1 cm. It does not contain a dielectric. Determine the capacitance. (a) 3.2x10^-12 F (b) 4.4x10^-12 F  (c) 3.4x10^-12 F (d) 3.9x10^-12 F

2. The capacitor in question #1 is altered so that the plate separation is tripled and a dielectric is inserted (K=2.0). Determine the new capacitance in terms of the original capacitance.  (a) 0.7Co (b) 0.8Co (c) 0.9Co (d) Co

3. The geometry of a capacitor determines its capacitance. Of the following, which is directly related to the capacitance of a cylindrical capacitor?  (a) The outer radius (b) The inner radius (c) The length. (d) None of the above

Answer 1

a)

  

  

Answer is option (c)

b) Distance between the plates is triples

Let the new distance between the plates

         

         

  

Answer is option (a)

c)

So, the capacitance is directly proportional to length of cylinder

Answer is option (c)