With a sharp tip of pencil mark four points on a paper and name them by the letters A, C, Pand H. Try to name these points in different ways. One such way could be this:

A,B and C are three collinear points. How many line segment can be determined by them? Name these lines segments?

Four point charges are placed at the four corners of a square in the two ways as shown in the fig. Will the electric field at the centre of the square, be the same or different in the two configurations and why?

Four point charges are placed at the four corners of a square in the two ways (a) and (b) as shown figure. Will the Electric potential at the centre of the square be the same or different in the two configurations and why?

Four point charges are placed at the four corners of a square in the two ways as shown in the fig. electric potential at the centre of the square be the same or difference in the two configurations and why?

Two different non-parallel lines meet the circle abs(z)=r . One of them at points a and b and the other which is tangent to the circle at c. Show that the point of intersection of two lines is (2c^(-1)-a^(-1)-b^(-1))/(c^(-2)-a^(-1)b^(-1)) .

Two long parallel wire P and W are both perpendicular to the plane of the paper with distance of 5 m between them . If P and W carry current of 2.5 A and 5A respectively in the same direction, then the magnetic field at a point half-way between the wires is

Use the figure to name (a) Five points (b) A line (c) Four rays (d) Five line segments.

Name the line given in all possible (twelve) ways choosing only two letters at a time from the four given.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Explain the different ways apomictic seeds can develop. Give an example of each. (b) Mention one advantage of apomictic seeds to farmers. (c) Draw a labelled mature stage of a dicotyledonous embryo.