प्रत्येक 0.15 μF धारिता वाले चार कैपेसिटर समांतर क्रम में जुड़े हुए हैं। उनकी तुल्य धारिता (equivalent capacitance) कितनी होगी?

A conductor made of 25 identical strands is used for a transmission line. If each strand has a capacitance of C μF with respect to the neutral wire, the total phase-to-neutral capacitance of the conductor is:

A parallel plate capacitor with capacitance C = 14 pF is charged by a battery to a potential difference V = 12 V. The battery is then disconnected. A porcelain slab with a dielectric constant K = 7 is inserted into the gap. Assuming frictionless motion and that the slab fits tightly between the plates, what is the maximum kinetic energy (in pJ) that the slab can achieve as it oscillates back and forth?