UN Fisika 2016 Paket 1 Nomor 31

Tiga muatan listrik identik ditempatkan seperti pada gambar berikut.

31

Jika besar {{q}_{1}}={{q}_{2}}={{q}_{3}}=q resultan gaya listrik yang dialami muatan {{q}_{1}} adalah …

A. \frac{kq}{r} D. \frac{{{k}^{2}}{{q}^{2}}}{{{r}^{2}}}\sqrt{2}
B. \frac{kq}{r}\sqrt{2} E. \frac{{{k}^{2}}{{q}^{4}}}{{{r}^{4}}}
C. \frac{k{{q}^{2}}}{{{r}^{2}}}\sqrt{2}

Penyelesaian

Karena ketiga muatan sama besar, {{F}_{21}}={{F}_{31}}=F

31-kunci

Resultan gaya R

R=\sqrt{{{F}^{2}}+{{F}^{2}}}=F\sqrt{2}

R=k\frac{{{q}^{2}}}{{{r}^{2}}}\sqrt{2}

jawaban C

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