Atoms — Physics STD 12 Science — Question

Write relation between magnetic induction B, magnetic field H and intensity of magnetisation I.

A capacitor and a bulb are joined in series with an ac voltage source. If frequency of alternating emf is increased then what is the effect on the circuit?

A proton and an electron travelling along parallel paths enter a region of uniform magnetic field, acting perpendicular to their paths. Which of them will move in a circular path with higher frequency?

Answer the following questions:
Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why?

Write the relationship between angle of incidence ‘i’, angle of prism ‘A’ and angle of minimum deviation for a triangular prism.

Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why?

Use the definition of linear pomentum from the previous question. Can we state the principle of conservation of linear pomentum for a single particle?

Which is more dangerous ac current or de current of same voltage?

A van of mass 1500kg travelling at a speed of 54kmh^-1 is stopped in 10s. Assuming that all the mechanical energy lost appears as thermal energy in the brake mechanism, find the average rate of production of thermal energy is cals^-1.