The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge

400 volt

Explanation:

since the charge is constant

V1*r1 = V2*r2

V2 = V1r1/r2

= (200×4) ÷ 2

= 800/2

= 400 Volt

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.