1. A cyclotron is a device for accelerating charged particles to high speed as they follow an expanding spiral-like path.

The charged particles are subjected to both an electric field and a magnetic field. One of these fields increases the speed of the charged particles, and the other field causes them to follow a curved path.Which field performs which function?

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2. A magnet can exert a force on a moving charged particle, but it cannot change the particle's kinetic energy. Why not?

3. A beam of high-energy protons emerges from a cyclotron. Do you suppose that there is a magnetic field associated with these particles? Why or why not? .

4. When a current is passed through a helically coiled spring, the spring contracts as if it's compressed. What's your explanation?