Which change will increase the magnetic strength of an electromagnet?

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Multiple Choice

Which change will increase the magnetic strength of an electromagnet?

The strength of an electromagnet grows with ampere-turns and with how well the core concentrates magnetic flux. Ampere-turns are the product of the number of turns and the current (N × I); more turns add more loop pathways for the current, and higher current directly increases the magnetomotive force. A stronger, high-permeability core concentrates the flux, boosting the field, while a weaker core would reduce it. Increasing resistance won’t strengthen the field because it tends to reduce current for a given supply. Therefore, increasing both turns and current most effectively increases the magnetic strength.

The strength of an electromagnet grows with ampere-turns and with how well the core concentrates magnetic flux. Ampere-turns are the product of the number of turns and the current (N × I); more turns add more loop pathways for the current, and higher current directly increases the magnetomotive force. A stronger, high-permeability core concentrates the flux, boosting the field, while a weaker core would reduce it. Increasing resistance won’t strengthen the field because it tends to reduce current for a given supply. Therefore, increasing both turns and current most effectively increases the magnetic strength.

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