EARTH SCIENCE
MAGNETISM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
by reducing the generator’s rotational speed
|
|
|
by reducing the mechanical work put into the generator
|
|
|
by increasing the resistance of the coils in the generator
|
|
|
by increasing the number of coils in the generator’s electromagnet
|
Detailed explanation-1: -It increases output voltage by decreasing the number of wire turns in the secondary coil. Two magnets are stuck end to end by a magnetic force.
Detailed explanation-2: -If the generator is made to spin faster, the voltage output increases.
Detailed explanation-3: -You can add more coils on top of the first row, and this just adds more field strength. In technical terms, every coil of wire increases the “magnetic flux density” (strength) of your magnet. The magnetic field on the outside of the coil resembles a bar magnet.
Detailed explanation-4: -Doubling the number of coils doubles the mmf (ampere-turns): “By maintaining the same current and increasing the number of loops or turns of the coil, the strength of the magnetic field increases because each loop or turn of the coil sets up its own magnetic field.
Detailed explanation-5: -As the number of coils are increased the magnetic field will become stronger, because each coil has its own magnetic field, so the more coils there are the more field lines there are which means it would be a stronger electromagnet.