Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is . The field of induction at a distance 12 cm from the same current would be

(a) 3.33

(b) 1.11

(c) 3

(d) 9

Ionization energy of hydrogen is 13.6 eV. If h = 6.6 , the value of R will be of the order of

(a)

(b)

(c)

(d)

A point charge is kept at the centre of metallic insulated spherical shell. Then:

A capacitor of capacity  is charged to the potential of . On disconnecting with the battery, it is connected with a capacitor of capacity   as shown in the adjoining figure. The ratio of energies before and after the connection of switch  S will be

(a) (

(b)

(c)

(d)

A proton, a deuteron and an α particle are accelerated through same potential difference and then they enter in a normal uniform magnetic field, the ratio of their kinetic energies will be:

The period of oscillation of a vibration magnetometer depends on which of the following factors

(a) I and M only

(b) M and H only

(c) I and H only

(d) I, M and H only

One face of a rectangular glass plate 6 cm thick is silvered.  An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is

(a) 0.4

(b) 0.8

(c) 1.2

(d) 1.6

Maximum value of voltage in an ac circuit is 282 V. The effective magnitude of voltage is:

When the length and area of cross-section both are doubled, then its resistance

(a) Will become half	(b) Will be doubled
(c) Will remain the same	(d) Will become four times