Consider three polarizer’s P1, P2 and P3 placed along an axis. The pass axis of P1 and P3 are at right angles to each other while the pass axis of P2 makes an angle θ with that of P1. A beam of unpolarized light of intensity I0 is incident on P1 as shown. The intensity of light emerging from P3 is

( a ) 0                                        ( b )   I ₀ / 2           

( c ) ( I ₀ / 8 ) sin ² 2 θ               ( d ) ( I ₀ / 4 ) sin ² 2 θ

Prove that the angle between the surface of an inclined plane and a the horizontal (the angle of inclination) is equal to the angle between the normal of the plane and the vertical.

 

The angle between the surface of an inclined plane and a the horizontal (the angle of inclination) is equal to the angle between the normal of the plane and the vertical.

Three particles, each having a charge of 10 µC are placed at corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of system is ? ( Given 1/4πεo = 9 X 109 N-m2C2) (MHT-CET ~ 2011)

Three particles, each having a charge of 10 µC are placed at corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of system is ? ( Given   = 9 X 10⁹ N-m²C²) (MHT-CET ~ 2011)

a ] zero                                 b] Infinity                            c] 27 J                    d] 100 J