Jen's teacher tells her that she can use the pith-ball electroscope to see if any of the rubber tubes are surrounded by an electric
field. What should Jen do to test for an electric field surrounding each tube?
А.bring the magnet close to the plastic ball and note any motion of the ball toward the magnet
B. connect the three tubes to each other and see if they attract the plastic ball
C.hold the magnet in direct contact with the tube that was submerged in water
D. bring each tube close to the plastic ball and note any movement of the ball

Electric fields can exert forces on objects, even if the objects involved are not touching. One way to demonstrate that electric fields exist around charged objects is to observe the effects of their forces at a distance.

Since the plastic ball of the electroscope is made of insulating plastic and is uncharged, it will be attracted to any charged object brought near it. So Jen can observe the effects of the tube's electric fields by bringing each tube close to the plastic ball and noting any movement of the ball. If the ball moves toward a tube, then the process that Jen used on the tube generated an electric field.

^explanation on study island