200 cm2 प्लेट क्षेत्र और 2.0 mm की दूरी वाला एक समानांतर प्लेट कैपेसिटर 60 V का विभवांतर लगाने पर 0.06 μC का आवेश रखता है। प्लेटों के बीच भरी गई सामग्री का परावैद्युतांक (dielectric constant) लगभग कितना है? (दिया गया है: ε0 = 8.85 × 10-12 C2 N-1 m-2)

Two electric dipoles of moments P and 27P are placed on a line with their centers 24 cm apart. Their dipole moments are directed opposite to each other. At what distance between the dipoles, from the center of the dipole of moment P, will the net electric field be zero?

A point charge q = 1 μC is located at a distance of 2 cm from one end of a thin insulating wire of length 10 cm having a charge Q = 24 μC, distributed uniformly along its length. The electrostatic force between q and the wire is _____ N. (Use 14πε0 = 9 × 109 N m2/C2)