What will be the effect on the capacitance of capacitor when you slide one of the plate relatively to the other so the overlap is halved?

When you slide one of the plates of a capacitor to reduce the overlap area by half, the capacitance will decrease. Capacitance is directly proportional to the overlapping area of the plates; therefore, halving the area results in a corresponding reduction in capacitance. The new capacitance can be calculated using the formula ( C = \frac{\varepsilon A}{d} ), where ( A ) is the area of overlap. Thus, a decrease in area leads to a decrease in capacitance.