A swimmer heads directly across a river swimming at 1.9 ms, Ask an Expert

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Q. Two point charges q1 = 2.6 multiplied by 10-8 C and q2 = -3.2q1 are fixed in place 50 cm apart. Find the point along the straight line passing through the two charges at which the electric field is zero, as measured from q1.

Q. A swimmer heads directly across a river, swimming at 1.9 m/s relative to the water. She arrives at a point 34 m downstream from the point directly across the river, which is 80 m wide.

a) What is the speed of the river current?
b) What is the swimmer's speed relative to the shore?
c) In what direction should the swimmer head so as to arrive at the point directly opposite her starting point?

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