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33.2 Exercise 7

Avg difficulty 2.5

An atomic nucleus consists of positively charged protons and neutral neutrons, so the electrostatic repulsion should destroy it by making the protons fly apart. This doesn't happen because:

  1. The strong force is ~100 times stronger than electromagnetism.
  2. The weak force generates massive particles that hold it together.
  3. Electromagnetism is sometimes attractive.
  4. Gravity is always attractive.

OpenStax College Physics 2e, 33.2 The Four Basic Forces, exercise 7

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.