Two point charges \( Q \) and \( -3 Q \) are placed some distance apart. If the electic field at...

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Two point charges \( Q \) and \( -3 Q \) are placed some distance apart. If the electic field at the location of \( \mathrm{Q} \) is \( \vec{E} \), the field at the location of \( -3 Q \) is
a. \( \vec{E} \)
b. \( 2 \vec{E} \)
c. \( +\frac{\vec{E}}{3} \)
d. \( -\frac{\vec{E}}{3} \)
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