ON20 P41 Q5 Potential Graph Between Two Point Charges | Oct/Nov 2020 | Cambridge A Level Physics
Автор: ETphysics
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9702/41/O/N/20: (a) Define electric potential at a point.
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(b) Two point charges A and B are separated by a distance of 12.0cm in a vacuum, as illustrated
in Fig. 5.1. The charge of A is +2.0 × 10^–9C. A point P lies on the line joining charges A and B. Its distance from charge A is x. The variation with distance x of the electric potential V at point P is shown in Fig. 5.2. Use Fig. 5.2 to determine:
(i) the charge of B
(ii) the change in electric potential when point P moves from the position where x = 9.0cm to the position where x = 3.0cm.
(c) An α-particle moves along the line joining point charges A and B in Fig. 5.1.
The α-particle moves from the position where x = 9.0cm and just reaches the position where
x = 3.0cm. Use your answer in (b)(ii) to calculate the speed v of the α-particle at the position where x = 9.0cm.
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