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Please help me because I didn't know why. If you know please help me!!

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  • $\begingroup$ A scalar is invariant under rotations, is current? $\endgroup$
    – JEB
    Commented Jan 15, 2019 at 16:45
  • $\begingroup$ Yes it is under rotations. $\endgroup$
    – M.E.A2002
    Commented Jan 15, 2019 at 16:49
  • $\begingroup$ What about its sign under a 180 deg rotation? $\endgroup$
    – user45664
    Commented Jan 15, 2019 at 17:10

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