Exercise 8. Complete the sentences using the words in brackets

Pattern: If I had time to spare, (go to the cinema).

If I had time to spare, I’d go to the cinema.

1. If we knew hoe to operate the device, (to use it). 2. If we raise the temperature, (to heat a body). 3. If the problem were easy, (to solve it). 4. If they had been at home yesterday, (to visit them). 5. If a bar of iron were placed in a strong magnetic field, (to experience strong forces). 6. If electrons pushed their way through the metal, (to encounter continuous opposition). 7. If we used electron streams as a source of heat, (to pass a current through a thin wire). 8. If the wire were made from an alloy such as nichrome, (to offer a considerable resistance to the electrons). 9. If our intention were to use the electric current as a source of light, we (to use a metal such as tungsten). 10. If the iron came under magnetic forces, the particles (to orient themselves). 11. If iron of certain type were placed inside a coil through which electricity is passed, (to become a “permanent magnet”). 12. If the current were switched off, an electromagnet (to lose its magnetism). 13. If the temperature had not been raised, the body (not to have been heated). 14. If we hadn’t considered the principles of electric and magnetic dipoles, (to obtain a better understanding of the principles of electricity and magnetism). 15. If we had not used the definition, (to determine the value of the force). 16. If a bar specimen had been placed free to move in a magnetic field, (to line up parallel to the external field).