What is the total charge of the neptunium nucleus? (The neutral neptunium atom h

Question

What is the total charge of the neptunium nucleus? (The neutral neptunium atom has 93 electrons.) 1.49 x 10-17 C You are correct. Previous Tries What is the magnitude of its electric field at a distance of 5.90x1010 m from the nucleus? 3.84x1011 N/C You are correct. Previous Tries What is the magnitude of the force on an electron at that distance? 3.63 10-17 N F-qE and remember to use the charge in coulombs. Incorrect. Tries 2/20 Previous Tries What would the magnitude of the force be if the distance of the electron from the nucleus were tripled? Submit Answer Tries 0/20

Explanation / Answer

F= Eq ( charge of electron = 1.6x10-19 C )
   = 3.84x1011 * 1.6x10-19
   = 6.14x10-8 N

As field is inversely proportioanl to square of distance from charge, with distace being three times , field will decrease by 9 times.
Since force is proportional to field, force also decrease 9 times.
Hence force on electron, with distance becoming three times is
6.14 x 10-8 / 9 = 6.8 x10-9 N

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