Wave Optics — Physics STD 12 Science — Question

Correct mathematical form of Ampere's rule is:

An inductor, a resistance and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance:

1. Of the inductor increases.
2. Of the resistor increases.
3. Of the capacitor increases.
4. Of the circuit increases.

Self induction of a solenoid is

(a) Directly proportional to current flowing through the coil

(b) Directly proportional to its length

(c) Directly proportional to area of cross-section

(d) Inversely proportional to area of cross-section

In the given figure, when key K is opened, the reading of the ammeter A will be

(a) 50 A

(b) 2 A

(c) 0.5 A

(d)

An electron (charge q coulomb) enters a magnetic field of H   with a velocity of vm/s  in the same direction as that of the field the force on the electron is

(a) Hqv Newton’s in the direction of the magnetic field

(b) Hqv dynes in the direction of the magnetic field

(c) Hqv Newton’s at right angles to the direction of the magnetic field

(d) Zero

A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index = μ, is introduced in the path of the beam. The convergence point is shifted by

(a) away

(b)  away

(c)  nearer

(d)  nearer

A photon and an electron have equal energy E.  is proportional to

(a)	(b) 1/
(c) 1/E	(d) Does not depend upon E

Find the true statement.

A charged particle moves through a magnetic field perpendicular to its direction. Then:

The lines of force due to earth’s horizontal magnetic field are: