A student wishes to make the magnetic force exerted by the electromagnet shown below greater.
Which procedure step could the student follow to accomplish this goal?
open the switch at location 2
reduce the number of wire turns at location 4
add more batteries in series at location 3
increase the length of wire at location 1
add more batteries in series at location 3
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To make the magnetic force exerted by the electromagnet greater, the student could follow the procedure step of adding more batteries in series at location 3.
Explanation:
The strength of an electromagnet depends on the number of turns in the wire coil and the amount of electrical current passing through it. Increasing the number of batteries connected in series at location 3 will increase the current flowing through the wire coil, which in turn will increase the magnetic force produced by the electromagnet.
Opening the switch at location 2 will simply disconnect the circuit and no current will flow, resulting in no magnetic force being produced.
Reducing the number of wire turns at location 4 will decrease the strength of the magnetic field, resulting in a weaker magnetic force.
Increasing the length of wire at location 1 will have no effect on the strength of the magnetic field. The number of turns and the current are the influencing factors for the magnetic force, not the length of the wire.