GEOLOGY

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EARTH SCIENCE

MAGNETISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A student is performing an investigation on electromagnets using the supplies shown below. The student wants to determine how the size of the nail affects the strength of the electromagnet. The student uses a different nail in each trial but keeps the same number of coils in the wire and uses the same battery. Which is the dependent variable in this investigation?
A
type of battery
B
size of nail
C
number of coils in wire
D
strength of electromagnet
Explanation: 

Detailed explanation-1: -A wider nail will make the magnet stronger. Making the nail longer will not make the magnet stronger, unless you also add more turns to the coil.

Detailed explanation-2: -The strength of an electromagnet changes depending on the size of the attached battery. A higher voltage battery will produce a larger current through the same wire. This, in turn, results in a stronger magnet.

Detailed explanation-3: -Increasing the number of turns in the coil of wire did increase the strength of the electromagnet. For example at 20 turns, it could pick up 1 paper clip but at 80 turns it could pick up 3 paper clips. It needed on average another 25 turns to pick up another paper clip.

Detailed explanation-4: -The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage. Was this answer helpful?

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