Engineering Board Exam Reviewer · Physics · medium

If the distance between two charges is halved, the electrostatic force between them becomes:

  1. Twice as large
  2. Half as large
  3. Four times as large
  4. One-fourth as large

Answer

C. Four times as large

Solution

F 1/r2.

More Physics questions

  1. What is the force between two point charges of 2 C and 3 C separated by 10 cm in air? (k = 8.99 × 109 N· m2/C2)
  2. Polarized light of intensity I0 passes through a polarizer whose axis makes 60° with the light's plane of polarization. What is the…
  3. In Young's double-slit experiment, light of wavelength 600 nm passes through slits 0.2 mm apart onto a screen 1 m away. What is the…
  4. Two thin lenses with focal lengths of +20 cm and −50 cm are placed in contact. What is the power of the combination?
  5. A concave mirror has a radius of curvature of 40 cm. What is its focal length?
  6. A lens has a focal length of +25 cm. What is its power?
  7. An object is placed 10 cm in front of a converging lens of focal length 20 cm. Describe the image.
  8. An object is placed 30 cm in front of a converging lens of focal length 10 cm. Where is the image formed?
  9. What is the speed of light in water (n = 1.33)?
  10. What is the critical angle for light traveling from glass (n = 1.5) to air?

All Physics Reviewer questions