6. Wheatstone bride combination: Calculate equivalent capacitance between points A and B.

If the ratio of capacitors C_{1} and C_{2} is same to the ratio of capacitors C_{3} and C_{4} then no charge pass through capacitor C_{5}. So, the capacitors C_{1}, C_{2} and C_{3}, C_{4} are in series connection and their combinations are in parallel connection between points A and B.

If C_{1} = C_{2} = C_{3} = C_{4} = C then C_{eq} = C.