Name a physical quantity used to measure optical density of a Medium

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devrudra07
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1.A rectangular loop and a Circular loop are moving out of a uniform magnetic field to a field free region with a constant velocity V.In which loop the induced e.m.f is constant during the motion of the loop.

2.Name two Physical quantifies other than velocity,wavelength and C,associated with electromagnetic waves.

3.Name a physical quantity used to measure optical density of a Medium.

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In a rectangular loop what is the overall emf induced? In a circular coil, what is the emf induced?

2) What do you think defines waves?
 
rock.freak667 said:
In a rectangular loop what is the overall emf induced? In a circular coil, what is the emf induced?

2) What do you think defines waves?

i've given the complete question.nothing more to it.
i guess the ans to second one is electric and magnetic field.just checking