KCET 2025 Physics Paper

To determine the work done in moving a charge from point B to point A , we use the formula:
Wext=q∆V
Where:
q is the charge being moved, given as 5 mC or 5×10−3C.
∆V is the change in electric potential between the two points: Vf−Vi.
Given:
Potential at point A, VA=−3V
Potential at point B,VB=5V
Substitute these values into the formula:
‌W‌ext ‌=5×10−3(VA−VB)
‌=5×10−3(−3−5)
‌=5×10−3×(−8)
‌=−40×10−3J
‌=−0.04J
Thus, the work done in carrying the charge from point B to point A is -0.04 J .