1. A beam of electrons is shot between the opposite poles of magnets. What happens?
2. Two wires are placed side by side. Currents are run through the wires in opposite directions. What is observed?
3. A galvanometer’s needle points ...?
4. A straight wire is moved vertically downwards to cut the magnetic field lines between oppositely charged magnetic poles. What happens?
5. In an a.c. generator, what happens when the strength of the magnetic field increases?
6. What happens in a d.c. motor when the thickness of the wire is increased?
7. What happens in an a.c. generator when the coil rotates at a higher speed?
8. What is the function of a split ring commutator?
9. What is a diode used for?
10. A transformer has 10 turns in its primary coil. It is supplied with a 20V d.c. and has 500 turns in its secondary coil. What is the voltage across its secondary coil?