It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving

(a) α-particles and

(b) neutrons? Justify your answer.

Write the uses of radio isotopes in

(a) agriculture

(b) industries.

Study the following electric circuit. Find the reading of

(a) the ammeter and

(b) the voltmeter

The diagram below shows a point source P inside a water container. Four rays A, B, C and D starting from the source P are shown upto the water surface.

(a) Show in the diagram, the path of these rays after striking the water surface. The critical angle for water-air surface is 48°.

(b) Name the phenomenon which the rays B and D exhibit.

(c) Can total internal reflection occur when rays travel from rarer medium to denser medium?