11. A \( -1.5 \mathrm{mC} \) charge is moving towards a stationary \( +6.8 \mathrm{mC} \) charge. What is the change in potential energy as the particle moves from \( 75 \mathrm{~cm} \) away from the stationary charge to only \( 33 \mathrm{~cm} \) from the stationary charge? Did the potential energy increase or decrease?
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