ELECTROMAGNETIC INDUCTION — Physics STD 12 Science — Question

Which of the following two statements is more appropriate?

1. Two forces are added using triangle rule because force is a vector quantity.
2. Force is a vector quantity because two forces are added using triangle rule.

Answer the following question:
You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.

What happens to the energy of light waves in interference?

The distance of the field point, on the equatorial plane of a small electric dipole is halved. By what factor does the electric field due to the dipole change?

Give explanation of linearly pofarized, unpolarized and plane polarized wave.

State the research done by scientists on electromagnetism after Oersted's observation.

Figure shows a circular wheel of radius 10.0cm whose upper half, shown dark in the figure, is made of iron and the lower half of wood. The two junctions are joined by an iron rod. A uniform magnetic field B of magnitude 2.00 × 10^-4 T exists in the space above the central line as suggested by the figure. The wheel is set into pure rolling on the horizontal surface. If it takes 2.00 seconds for the iron part to come down and the wooden part to go up, find the average emf induced during this period.

Evaluate Rydberg constant by putting the values of the fundamental constants in its expression.