1.

Pick out the expression of electric potential energy from the following.

A. U = ( frac {1}{(4 pi varepsilon_o)} times [ frac {q_1q_2}{r} ] )
B. U = 1 (4 <sub>o</sub>) [ ( frac {q_1q_2}{r} ) ]
C. U = ( frac {1}{(4 pi varepsilon_o)} times [ frac {q_1}{q_2}{r} ] )
D. U = ( frac {1}{(4 pi varepsilon_o)} ) [q<sub>1</sub>q<sub>2</sub>]
Answer» B. U = 1 (4 <sub>o</sub>) [ ( frac {q_1q_2}{r} ) ]


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