“Sneha wanted to know why paraffin wax in a candle and the wick in a deepavali oil lamp bun with a flame.” What reason can you give ?

Do you know you are living being ? How can you say that ?give reasons

Answer carefully: (a) Two large conducting spheres carrying charges Q_(1) and Q_(2) are brought close to each other. Is the magnitude of electrostatic force between them exactly given by Q_(1),Q_(2)//4pi epsilon_(0)r^(2) , where r is the distance between their centres? (b) If Coulomb’s law involved 1//r^(3) dependence (instead of would Gauss’s law be still true ? (c) A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point? (d) What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical? (e) We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there? (f) What meaning would you give to the capacitance of a single conductor? (g) Guess a possible reason why water has a much greater dielectric constant (= 80) than say, mica (= 6).

Here is a ray overline(OA) . It starts at O and passes through the point A. It also passes through the point B. Can you name it as overline(OB) ? Why? Can you write the ray overline(OA) as overline(AO) ? Why? Why not? Give reasons.

Explain giving reasons: In which of the following situations water will get hearted in shorter time? Srikar kept water beaker near the wick in the yellow part of a candle flame.

Draw two lines on a paper as shown below. Do they intersect each other? Can you call them parallel lines? Give reason. Make a pair of parallel lines what is the angle formed between them ? Think, discuss with your friends and teacher.