Q31. An electrical field of \(1.92\times 10^3 N/C\) is maintained across two plates separated by 0.015 m. Potential difference across plates will be

Q32. By inserting a plate of dielectric material between the plates of a parallel plate capacitor at constant potential, the energy stored in the capacitor is increased five times. The dielectric constant of the material is

Q33. For all the capacitors connected in series, the charge on all of them is always \(_{--------------}\) and the voltage across them is \(_{--------------}\).

Q34. If three 10 \(\mu\)F capacitors are connected in parallel, the net Capacitance is

Q35. The type of energy possessed by the charged capacitor is

Q36. A \(8\:\mu F\) capacitor is connected in series with a \(800\:k\Omega\) resistor across \(200\:V\) DC supply. Determine final value of charging current.

Q37. How should capacitors be discharged?

Q38. The unit of susceptibility is

Q39. What is the flux density in a magnetic field of cross-sectional area 20 \(cm^2\) having a flux of 3 mWb?

Q40. Hard steel is suitable for making permanent magnets because