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The atomic weight of an element is double its atomic number. If there are four electrons in 2P orbital, the element is:
(1) C
(2) N
(3) O
(4) Ca
Ans: O
Illustrate "Tangent law" in magnetism. Compare magnetic moment of two bar magnet in a tan A, tan B position by null method or equal distance method.
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Explain pure spectrum of white light
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