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Mathematics 20 Online
OpenStudy (anonymous):

Prove that ∇.∇×A ̅=0

OpenStudy (anonymous):

The electric field intensity is given as E ⃗=4(a_x ) ̂+2(a_y ) ̂-5(a_z ) ̂ at (-1,2,0)m due to a point charge at origin. Find the value of the point charge.

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