Explanation:
First of all friend attach a picture with the question then only I can Solve......
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Answer:
Explanation:
From the question we are told that:
Diameter 
Radius 
Potential 
Generally the equation for Potential on spere is mathematically given by
Therefore
Where
Therefore
The best answer would be:
B. Epi pen
Here is more about it:
An epi pen injects epinephrine into the body to counteract the effects of an allergic reaction. Epinephrine helps narrow blood vessels and open up the airways. This can be used for food allergies, insect bites, and some other allergens. It is very effective and immediately works, but it is short-lived, so seeking medical attention after is still needed.
A convex lens makes light rays converge (come together) at the focal point or focus. The distance from the center of the lens to the focal point is the focal length of the lens. Convex lenses are used in things like telescopes and binoculars to bring distant light rays to a focus in your eyes.
Plant and animal life, atmosphere and water are the major causes of weathering .
