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A compass needle is a permanent magnet, which itself reacts to the permanent magnet in the earth's axis. Unfortunately, the fields of permanent magnets are very hard to calculate, and require an understanding of complex ferromagnetic phenomena, belonging as much to atomic theory as to electromagnetism.
Think its M1 L1 T-2. Hope it helped
Answer:
Explanation:
given data:
power = 17.7 milliwatt
p = 17.7 *10^{-3} watt
wavelength = 532 nm = 532*10^{-9} m
energy of photon 
h is plank constant = 6.626*10^{-34} JOULE/SEC
C =3*10^8 m/sec
let n is m=number of photon emiited per sec
we knwo that
p = ne
To the right of calcium in the same period.
Hope this helps!
