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Unformatted text preview: 58. The ﬁeld of each charge has magnitude
= 3.6 × 10−6 N/C .
(0.020 m)2 The directions are indicated in standard format below. We use the magnitude-angle notation (convenient
if one is using a vector capable calculator in polar mode) and write (starting with the proton on the left
and moving around clockwise) the contributions to Enet as follows:
(E − 20◦ ) + (E This yields (3.93 × 10−6 130◦ ) + (E − 100◦ ) + (E − 150◦ ) + (E − 76.4◦ ), with the N/C unit understood. 0◦ ) . ...
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