What change should be made in an AC generator so that it may become a DC generator?

Why cannot two magnetic field lines cross each other?

Name the phenomenon which is made use of in an electric generator.

Why it necessary to connect an earth wire to electric appliances having metallic bodies?

A student while studying the force experienced by a current-carrying conductor kept in a magnetic field records the following observations:

i. The force experienced by the conductor increases as the current is increased.

ii. The force experienced by the conductor decreases as the strength of the magnetic field is increased.

Which of the two observations is correct and why?