In tropical region, paddy field soil harbour rich population of…………………..which produce methane.

The tropical region has a large population of animals .Explain Why it is so.

A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. this can be because

A charged particle is released from rest in a region of steady and uniform electric and magnetic fields which are parallel to each other . What will be the nature of the path followed by the charged particle?

A long vertical wire in which a current is flowing produces a neutral point with the earth's magnetic field at a distance of 5 cm from the wire. If the horizontal component of the earth's magnetic induction is 0.18 gauss, then the current in the wire is

Gas being produced by paddy fields amd involved in global warming is

Which regions of the earth would show rich biological activity?

An electron and a proton moving with same speed enter the same magnetic field region at right angles to the direction of the field. For which of the two particles will the radius of the circular path be smaller?

An electron enters with a velocity vecv=v_0hati into a cubical region (faces parallel to coordinate planes) in which there are uniform electric and magnetic fields. The orbit of the electron is found to spiral down inside the cube in plane parallel to the x-y plane. Suggest a configuration of fields vecE and vecB that can lead to it.

An electron beam of velocity v moving in the plane of paper enters a region of uniform magnetic field, which is perpendicular to the plane of the paper and traels in a circular path.Does the kinetic energy of electron change during this time? Give reason.