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An alpha particle (charge 2e) is sent at high speed toward a gold nucleus. The electric force acting on the alpha particle is 91 N when it's 2.

An alpha particle (charge 2e) is sent at high speed toward a gold nucleus. The electric force acting on the alpha particle is 91 N when it's 2.00 x 10^(exponent)-14m away from the gold nucleus What is the charge on the gold nucleus, as a whole number multiple of e? (e= 1.60 x 10^-19. kc= 8.99 x 10^9)

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