Wave Optics — Physics STD 12 Science — Question

Consider the self-inductance per unit length of a solenoid at its centre and that near its ends. Which of the two is greater?

The springs shown in the figure are all unstretched in the beginning when a man starts pulling the block. The man exerts a constant force F on the block. Find the amplitude and the frequency of the motion of the block.
 

What is the amount of work done in moving a point charge Q around a circular arc of radius ‘r' at the centre of which another point charge ‘q' is located?

Answer carefully:
Guess a possible reason why water has a much greater dielectric constant (= 80) than say, mica (= 6).

Answer the following questions:
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.

Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.

How electromagnetic radio waves are produced?

If in any electric circuit, phase of current lags the phase of potential difference by 90°, then what is the nature of reactance of the circuit?