A copper plate of thickness b is inserted between the plates of a parallel-plate capacitor of plate separation d. If b = d/3, the capacitances before and after the insertion of the plate are in the ratio
A. 2 : 3
B. 3 : 2
C. 1 : \(\sqrt {3}\)
D. \(\sqrt {3}\) : 1.
Answer:A
A copper plate of thickness b is inserted between the plates of a parallel-plate capacitor of plate separation d. If b = d/3, the capacitances before and after the insertion of the plate are in the ratio
A. 2 : 3 B. 3 : 2 C. 1 : \(\sqrt {3}\) D. \(\sqrt {3}\) : 1.