Magnetism And Matter — Physics STD 12 Science — Question

The distance between a proton and electron both having a charge 1.6  of a hydrogen atom is . The value of intensity of electric field produced on electron due to proton will be

(a) 2.304

(b) 14.4 V/m

(c) 16 V/m

(d) 1.44

Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a magnetic field?

1. Electron
2. Proton
3. He⁺
4. Li⁺

The process in which a region is made free from any electric field is known as _____________.

A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by

(a) 1.05   J-sec

(b) 3.16   J-sec

(c) 2.11   J-sec

(d) 4.22   J-sec

A ray passes through a prism of angle 60° in minimum deviation position and suffers a deviation of 30°. What is the angle of incidence on the prism

(a) 30°

(b) 45°

(c) 60°

(d) 90°

Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be

(a) 13.6

(b) 1.8

(c) 3.6

(d) 1.8

Which of the following is another term for magnetization?

When the wavelength of light coming from a distant star is measured it is found shifted towards red. Then the conclusion is

(a) The star is approaching the observer	(b) The star recedes away from earth
(c) There is gravitational effect on the light	(d) The star remains stationary

In the grid circuit of a triode a signal E = 2  is applied. If m = 14 and r_p =10 kW then root mean square current flowing through   will be

(a) 1.27 mA

(b) 10 mA

(c) 1.5 mA

(d) 12.4 mA