Snehasish ghosh Asked a Question
August 9, 2020 11:15 pmpts 30 pts
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  • Mahak Best Answer
    ans is 3 see attached here phi is replaced by U
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  • Vaishali sharma thankyou
    dear option would be ||| . because here derivative or phi would come with direction and only option left with direction is 3rd
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    Vaishali sharma
    so we can simply check by using options.
  • Vaishali sharma
    see this as well
    • cropped8400906831020489364.jpg
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    Vaishali sharma
    it will help u
  • Chandra dhawan
    see attachment
    • cropped7875354299175517893.jpg
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    Chandra dhawan
    it's very helpful
  • Ruby negi
    del phi means gradiant of phi
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