Due to changes in land usage, biodiversity is facing extinction in many places today.

Due to changes in land use policy, biodiversity is facing extinction in many places today-Judge the accurary of the statement with five examples.

The distance between two points A and B in vacuum is 2d. At each of these two points a + Q charge is placed. P is the midpoint of AB. Find the intensity and potential at P due to the electric field. How will the values of these quantities change if the charge at B is replaced by a charge -Q ?

A thin glass plate is placed in between a convex mirror of focal length 20cm and a point source. The distance between the glass plate and the mirror is 5cm. The image formed by the reflected rays from the front face of the glass plate and that due to the reflected rays by the convex mirror coincide at the same point. What is the distance of the glass plate from the source? Draw the ray diagram.

In vacuum (i) find out the electric flux across an area vec S = 10 hatj placed in an electric field vec E = 2 hati + 4 hatj + 7 hatk , (ii) How many electric charges are to be placed at a point such that 4400 number of electric lines of forces with emerge from that point ? (iii) What will be the electric flux through any one of the faces of a cube of side 10 cm if a charge of 1 esu is placed at the centre of the cube ?

In many plants the change over from vegetative to reproductive phase takes place in response to

How many alpha and beta -particles are emitted when U-238 changes to Pb-206 due to radioactivity. Atomic numbers of U-238 and Pb-206 are 92 and 82 respectively.

How many alpha and beta particles are emitted when U^238 changes to Pb^206 due to radioactivity? Atomic number of U^238 , Pb^206 are 92 and 82 respectively.