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Consider the following electric field lines generated by two charged particles:
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Is charge 1 negative or positive? Is charge 2 negative or positive?
Charges 1 and 2 are both negative.
Charges 1 and 2 are both positive.
Charge 1 is negative and charge 2 is positive.
Charge 1 is positive and charge 2 is negative.
Charges 1 and 2 must both have the same charge but we cannot determine if both charges are negative or if both charges are positive.