Similarly as q=DA and q,A remains constant, D doesn’t change and as electric field intensity is given by, E=D/ε0, E also doesn’t change. 4. The area of two parallel plates is doubled and the distance between these plates is also doubled. The capacitor voltage is kept constant. Under these conditions, force between the plates of this capacitor __________
A. decreases
B. increases
C. reduce to half
D. gets doubled
Answer:A
Similarly as q=DA and q,A remains constant, D doesn’t change and as electric field intensity is given by, E=D/ε0, E also doesn’t change. 4. The area of two parallel plates is doubled and the distance between these plates is also doubled. The capacitor voltage is kept constant. Under these conditions, force between the plates of this capacitor __________
A. decreases B. increases C. reduce to half D. gets doubled
Explanation: A2=2A1, x2=2x1, v2=v1, fe2=1/2v2dC(x)/dx2, C2=ε0A2/x2 ⇒ dC2/dx2= -ε0A2/x22