Answer:

Explanation:
given data
Radius of sphere 3.0 cm
charge Q = 2.0 m C
We know that maximum electric field is given as

electric field inside the sphere can be determine by using below relation



Answer:
light doesn't need a medium through which to travel because the speed of light is experimentally constant
Ok, let me see if I can help
Sound is caused by vibrations. These can pass through a solid, liquid, and gas. But not through vacuum because there are no particles
Answer:
1. Battery
2. Copper wire
3. Nail or piece of metal (zinc, iron, or steel).