Please help me because I didn't know why. If you know please help me!!
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A scalar is invariant under rotations, is current? – JEB Jan 15 '19 at 16:45
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Yes it is under rotations. – M.E.A2002 Jan 15 '19 at 16:49
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What about its sign under a 180 deg rotation? – user45664 Jan 15 '19 at 17:10