Moving Charges and Magnetism — Physics STD 12 Science — Question

Let F_pp, F_pn and F_nn denote the magnitudes of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is 1fm:

1. F_pp > F_pn = F_nn
   
2. F_pp = F_pn = F_nn
   
3. F_pp > F_pn > F_nn
   
4. F_pp < F_pn = F_nn
   

Assertion :   Mass of moving photon varies inversely as the wavelength.

Reason     : Energy of the particle = Mass ×

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

The binding energy of Helium nucleus is 28Mev. What is it's average binding energy per nucleon?

In electrolysis, if the duration of the passage of current is doubled, the mass liberated i

(a) Doubled

(b) Halved

(c) Increased four times

(d) Remains the same

Consider a vehicle going on a horizontal road towards east. Neglect any force by the air. The frictional forces on the vehicle by the road:

1. Is towards east if the vehicle is accelerating.
2. Is zero if the vehicle is moving with a uniform velocity.
3. Must be towards east.
4. Must be towards west.

In a cathode ray tube, what is the effect on the beam of particles if it passes through the electric field?

The particles which can be added to the nucleus of an atom without changing its chemical properties are called

(a) Electrons

(b) Protons

(c) Neutrons

(d) None of the above

Which of the following products in a hydrogen atom are independent of the principal quantum number n? The symbols have their usual meanings.

1. vn.
2. Er.
3. En.
4. vr.

Magnitude of current at half power point in a circuit is:

In which of the following the final image is erect?

1. Simple microscope.
2. Compound microscope.
3. Astronomical telescope.
4. Galilean telescope.