First slide

Electrostatic potential

Question

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-13 cm is

Moderate

A

80 volts
B

8 x 10⁶ volts
C

9 volts
D

9 x 10⁵ volts

Solution

$V = 9 \times 10^{9} \times \frac{50 \times 1.6 \times 10^{- 19}}{9 \times 10^{- 15}} = 8 \times 10^{6} V$

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