Nuclei — Physics STD 12 Science — Question

At a place, the horizontal component of earth's magnetic field is B and angle of dip is 60°. What is the value of horizontal component of the earth's magnetic field at equator?

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by:

1. 0.5%
2. 1%
3. 2%
4. 4%

Which forces does a stationary charge produce? If the charge moves with uniform velocity then?

Why self-induction is called inertia of electricity?

Write two differences between charge and mass.

Answer the following questions:
The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?

Answer the following questions, which help you understand the difference between Thomson’s model and Rutherford’s model better.
Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?

Name the electromagnetic radiations used for viewing objects through haze and fog.

How would the angular separation of interference fringes in Young’s double slit experiment change when the distance between the slits and screen is doubled?