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ambil segitiga atas Axb
A=∅1
B=∅2
dari situ pakai lah rumus:
B(ab)=n0.l/4πa. (cos∅1-cos∅2)
=n0l/4π[½b]. (cos45°-cos135°)
=n0.l/2πb (½√2-(-½√2))
=n0.l/2πb(√2)
=n0.l√2/2πb
=√2.n0.l/2πb
ket: kawat bc,cd dan da memiliki arah dan nilai sama .
jadi kuat medan listrik di pusat bujur sangkar:
B=4B(ab)=2√2n0.l/πb
maaf klo ada yg keliru :)