The helium used to fill birthday balloons doesn’t come out of the air, but from. out of the ground. some of the gas might escape from the ground into the. atmosphere, but the majority of it is trapped in earth’s crust. based on what you have learned from the experiment, give a reasonable explanation for the presence of helium gas in earth’s crust.

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.