1. A balloon is charged with excess charge. This balloon is then put in a space with a
uniform electric field pointing towards +x direction. When there is no wind around,
this balloon is observed moving towards the -x
direction. What is the sign of excess
charge on the balloon?
(A ) Positive.
(B ) Negative.
(C ) Not enough information.
The Attempt at a Solution
I thought the answer was "A" but that is incorrect. I thought so only because of the second to last sentence. I thought of the whole "opposite charges attract." I also don't understand the significance of saying which direction the electric field is in, only that it points from positive to negative.