Adjecent figure shows a point P near a long conductor XY carrying a current I. MN is a short current carrying conductor, kept at the point P, parallel to the conductor XY.
(i) What is the direction of magnetic flux density ‘B’ at the point P due to the current flowing through XY?
(ii) What is the direction of the force experienced by the conductor MN due to the current flowing through XY?
On the basis of Huygen's wave theory, the laws of refraction
Given : AEB is the incident wave front and DGC be the refracted wavefront.
BC = V1t V1 = velocity of light in medium 1.
AD = V2t V2 = velocity of light in medium 2.
i) Existence of the refracted wave front DGC
ii)
Construction : From the point F a perpendicular FH is dropped.
Proof: ΔABC + ΔFHC [By simple geometry these triangles are similar (A.A.A.)]