Which of these is the best explaination for why two negatively charged balloons move apart without ever touching?
a)electrons from the one balloon jump to the other and push it, without ever touching it.
b) charged objects send little lightning bolts of electrons across the space between two balloons.
c) the space between objects is actually filled with charged particles that all interact.
d) electric charges have electric fields surrounding them to allow them to exert forces on other objects without touching them.

Hello, sorry this is a little late!

I believe the correct answer to your question would be option D, electric charges have electric fields surrounding them to allow them to exert forces on other objects without touching them.

I just took this test, and can 100% confirm this is the proper answer.

Hope this helps, and have a great day! :)

Explanation :

We know that two like charges repel each other and two unlike charges attract each other.

The space around a charged particle in which the effect of electric force on other charged particles is experienced is called electric field.

The two negatively charged balloons move apart without ever touching because electric charges have electric fields surrounding them to allow them to exert forces on other objects without touching them.

Hence, the correct option is (d).

(4). 8/3 ft/sec.

Speed of person's shadow growing = 2.66 ft/sec.

Explanation:

In the question,

The height of the pole is = 15 foot

Height of the person = 6 foot

Rate of walking away from the pole, v = dy/dt = 4 ft/sec.

Now,

Let us say the length of shadow is = x

and,

Distance of person from the pole is = y

So,

In the triangle EDC and EAB, from the similar triangle properties, we can say,

Now,

On differentiating the equation w.r.t, time, t, we get,

Therefore, the Speed at which the person's shadow is growing is 2.66 ft/sec.

Hence, the correct option is (4).