Magnetic, Electrical and gravitational Forces

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Across
  1. 9. emit (energy, especially light or heat) in the form of rays or waves.
  2. 10. the end of a magnet where the magnetic field is strongest
  3. 13. a type of energy that travels in waves through space at the speed of light
  4. 14. the flow of electric charge, usually electrons, through a conductor like a wire
  5. 15. an instrument for detecting or measuring a small electric current by movements of a magnetic needle or of a coil in a magnetic field
  6. 16. a material that doesn't allow electricity or heat to pass through it easily
  7. 17. occurs when an object has fewer electrons than protons
  8. 19. explains the three-dimensional shapes of molecules by assuming that electron pairs around a central atom repel each other and arrange themselves to minimize this repulsion
  9. 20. a material that allows electricity (or heat) to flow through it easily
Down
  1. 1. the north-seeking end of a magnet or the terminal of a battery or cell connected to the positive plate
  2. 2. the pole of a magnet that points toward the south when the magnet is suspended freely
  3. 3. waves that are created as a result of vibrations between an electric field and a magnetic field
  4. 4. a device that converts mechanical energy into electrical energy
  5. 5. the invisible area surrounding a magnet where its magnetic force can be felt
  6. 6. a magnetic field that surrounds our planet
  7. 7. to push away or force apart
  8. 8. the force that causes certain objects, like magnets, to attract or repel each other due to an invisible field surrounding them
  9. 11. a force that pulls objects or particles together
  10. 12. an object has more electrons than protons, resulting in an overall negative electrical state
  11. 18. an atom or group of atoms that has an electric charge