Moving Charges and Magnetism — Physics STD 12 Science — Question

That part of electromagnetic spectrum which is used to study crystal structure is:

For a given triode μ = 20. The load resistance is 1.5 times the anode resistance. The maximum gain will be(a) 16(b) 12(c) 10       (d) None of the above

The magnitude of the electric field due to a point charge at a distance of 4.0 m is 9 N/C. Distance of this point charged substance due to electric field of magnitude 16 N/C will be:

Assertion   :  Coloured spectrum is seen when we look through a muslin cloth.
Reason       : It is due to the diffraction of white light on passing through fine slits.(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.

Maxwell’s equations describe the fundamental laws of(a) Electricity only(b) Magnetism only(c) Mechanics only(d) Both (a) and (b)