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Q1)How can we find the poles of a current carrying solenoid?Is it on the basis of the direction of the current?Can we associate this with right hand thumb rule?
Q2)The magnetic field lines of a circular loop keep on diverging from the centre of the loop.Why?
Q3)Why stars appear shining?How can we relate this with refraction?

Asked by Jayalakshmi 16th March 2016, 11:10 AM
Answered by Expert


3. The light coming from a star undergoes atmospheric refraction due to varying optical densities of air at various altitudes. The continuously changing atmosphere refracts the light from the star by different amounts from one moment to the next. Thus, the star-light reaching our eyes increases and decreases continuously and the star appears to shine.


Kindly ask other questions as a separate query.

Answered by Expert 16th March 2016, 6:23 PM
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