If the sheet of the backlite is inserted between the plates of an air capacitor, the capacitance will :

Explanation

The capacitance of a capacitor is determined by the formula C = εA/d, where ε is the permittivity of the dielectric material, A is the area of the plates, and d is the distance between them. When a dielectric material like backlite is inserted between the plates, the permittivity ε increases because the dielectric constant of backlite is greater than that of air. As a result, the capacitance increases. Option A is incorrect because the capacitance does not decrease; Option B is incorrect because the capacitance does not remain unchanged; Option D is incorrect because the capacitance does not become zero. Option C is correct because the capacitance increases.