Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

If the self-inductance of an iron core inductor increases from 0·01mH to 10mH on introducing the iron core into it, what is the relative permeability of the core material used?

Which property of light is confirmed by the pattern of polarization?

At an airport, a person is made to walk through the doorway of a metal detector, for security reasons. If she/he is carrying anything made of metal, the metal detector emits a sound. On what principle does this detector work?

What is a packet of electromagnetic energy called?

Answer the following questions:
The charged currents in the outer conducting regions of the earth’s core are thought to be responsible for earth’s magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

Write any two properties of electric field lines.

Two converging lenses of unequal focal lengths can be used to reduce the aperture of a parallel beam of light without losing the energy of the light. This increases the intensity. Describe how the converging lenses should be placed to do this.

A biconvex lens made of a transparent material of refractive index 1.5 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason.

What is the nature of effective forces in the nucleus?