A student is participating in the school science fair. She wants to investigate household cleaners.

Which question can she best answer through scientific investigation?

Which household cleaner is most effective at removing stains?
Which household cleaner smells the best?
How often should a person use household cleaners?
Where should a person buy household cleaners?

Which household cleaner is most effective at removing stains? is the question she should be able to answer best.

Explanation:

In a school science fair, people coming to the fair will love to know answers to certain questions that the solution is better trusted with scientific conclusions. Other questions aside the chosen questions are easily answerable without scientific fact.

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

e) none of the above answers are correct