Question
An advantage of electromagnets over bar magnets is that you can easily vary the __ of the magnetic field. What word completes this sentence?
Answer
4.2
(211 Votes)
Joanne
Master · Tutor for 5 years
Answer
The word that completes the sentence is "strength".
Explanation
The question is asking for a word that completes the sentence, and the sentence is about the advantage of electromagnets over bar magnets. The key feature of electromagnets that sets them apart from permanent (bar) magnets is that their magnetic field can be easily changed. This is done by varying the amount of electric current that flows through the wire coil. When the electric current is increased, the strength of the magnetic field increases. Conversely, when the electric current is decreased, the strength of the magnetic field decreases. Therefore, the word that completes the sentence is "strength".