LEARNOGRAPHY

1.  A non-conducting solid sphere of radius R has a uniform charge density ρ. Calculate the electric potential at a point P located at a distance d from the center of the sphere, outside the sphere. 2. Two point charges, +q and -q, are placed a distance d apart. Find the electric field at a point P along the perpendicular bisector of the line joining the charges. 3. Three point charges q1, q2, and q3 are placed at the corners of an equilateral triangle of side length a. Find the electric field and potential at the center of the triangle. 4. Three point charges +Q, +2Q, and -3Q are placed at the vertices of an equilateral triangle. What is the net electric field at the centroid of the triangle? a) Zero b) Non-zero but not determinable c) Parallel to one of the sides of the triangle d) Perpendicular to one of the sides of the triangle 5. A spherical shell of radius R carries a uniformly distributed positive charge Q. What is the electric field inside the shell? a)...

   What is the distance between two convex lenses L A  and L B  with focal lengths F A  and F B ? F A +F B F A -F B F A F B 2. If a medium has a critical angle for total internal reflection from the medium to vacuum as 30 0 , what is the velocity of light in the medium? 0.5 × 10 8  m/s 3 × 10 8  m/s 1.5 × 10 8  m/s 0.2 × 10 8  m/s 3. The combination of which of the following processes results in the formation of a rainbow? Dispersion and Total Internal Reflection Dispersion and Absorption Refraction and Scattering Dispersion and Focussing 4. What is the focal length of a double concave lens with a radius of curvature 20 cm, if the refractive index of the glass with respect to the air is 5/3? 20 cm -20 cm 15 cm -15 cm 5. A diverging lens of power 65 D is combined with a convex lens of focal length, f = 20 cm. What are the power and focal length of the combination? 5 D, 33.7 cm 5 D, 66.7 cm 1.5 D, 33.7 cm -1.5 D, 66.7 cm 6. When a thin convex l...