Moving Charges and Magnetism — Physics STD 12 Science — Question

The masses of neutron and proton are 1.0087 a.m.u. and 1.0073  a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u.= 931 MeV)

(a) 28.4  MeV

(b) 20.8  MeV

(c) 27.3  MeV

(d) 14.2  MeV

Deviation of 5° is observed from a prism whose angle is small and whose refractive index is 1.5. The angle of prism is

(a) 7.5°

(b) 10°

(c) 5°

(d) 3.3°

Compton effect is associated with

(a) α -  rays

(b) β -  rays

(c) X-rays

(d) Positive rays

The coil is wound on an iron core and looped back on itself so that core has two sets of closely wound coils carrying current in opposite directions. The self inductance is.

Light is a electromagnetic wave. It was established by :

In the following circuit, the resultant capacitance between A  and  B is 1mF. Then value of  C is

(a)  μF

(b)  μF

(c)  μF

(d)  μF

Two coherent sources of intensities, I₁ and I₂ produce an interference pattern. The maximum intensity in the interference pattern will be

(a) I1 + I2

(b)

(c) (I1 + I2)2

(d)

 A bar magnet of the magnetic moment 5 Am² has poles 20cm apart. Calculate the pole strength.

When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their

(a) Energy decreases

(b) Energy increases

(c) Momentum increases

(d) Momentum and energy remain unchanged

Two circuits have mutual inductance of 0.1 H. What average e.m.f. is induced in one circuit when the current in the other circuit changes from 0 to 20 A in 0.02 s

(a) 240 V

(b) 230 V

(c) 100 V

(d) 300 V