26.A point source of electromagnetic radiation has an average power output of 800 W. The maximum value of electric field at a distance 4.0 m from the source is:

27.Two pure inductor coils of self-inductance L each are connected in series, the net inductance is:

28.The correct sequence of the increasing wavelength of the given radiation sources is:

29.When the current through a solenoid increases at a constant rate, the induced current: