8. A dielectric slab of dielectric constants k is slowly inserted inside the parallel plate capacitor having plate area A and separation between plates d as shown in figure. If dimensions of dielectric slab is same as plates of capacitor and capacitor is connected through the battery, then work done by agent will be (C = & A/d) (1) CE(k+1) (3)-CE (k-1) d (2) CE(k-1) (4)-CE (k-1) 9. A multi range current ammeter can be constructed by using a galvanometer circuit as shown in figure. We want a current meter that can measure 10 mA, 100 mA and 14 using a galvanometer of resistance 10 2 and that produces maximum deflection for current 1 mA. Value of S + S + 53 in ohms is G 10 mA www wwww S 100 mA S 1 Amp (1) (3) 100 999 (2) 10 (4) 10 10.A positively charged particle of specific charge a, accelerated by a potential difference V moves through a uniform transverse magnetic field B. The field occupies a region of width 1. The angle through which the charged particle deviates from initial direction of its motion is (1) sin-1 (3) cos B (2) sin 2Bl [2B1 a (4) Bl 3V 2V