1.

Two charges \[{{q}_{1}}\] and \[{{q}_{2}}\] are placed 30 cm apart, as shown in the figure. A third charge \[{{q}_{3}}\]is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is \[\frac{{{q}_{3}}}{4\pi \,{{\in }_{0}}}\,k,\] where k is

A. \[8{{q}_{1}}\] 
B. \[6{{q}_{1}}\]
C. \[8{{q}_{2}}\]
D. \[6{{q}_{2}}\]
Answer» D. \[6{{q}_{2}}\]


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