Which of the following affect electric or magnetic field strength? Some factors can be both types of fields and some may not affect neither.

Factors that affect electric or magnetic field strength include:

- Distance from the source: Both electric and magnetic fields weaken as distance from the source increases.
- Type and amount of material between the source and field: Certain materials can block or enhance electric or magnetic fields.
- Presence of other electric or magnetic fields: Fields can interact and combine or cancel out.
- Presence of electrical charges or currents: Electric fields are generated by charges, while magnetic fields are generated by currents.