You have given a power supply, copperwire, and an iron nail. What should you doto decrease the strength of the electromagnet?Increase the current from thepower supply and add the iron nailbecause as current increasesmagnetic field also increases( bothare directly proportional)Decrease the current from thepower supply because as currentdecreases magnetic field alsodecreases ( both are directlyproportional)Decrease the current becausemagnetic field and current areinversely proportional.Increase the current, and add theiron nail.

Answered: You have given a power supply, copper…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter24: Magnetic Fields

Section: Chapter Questions

Problem 102A

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Question

You have given a power supply, copper
wire, and an iron nail. What should you do
to decrease the strength of the electro
magnet?
Increase the current from the
power supply and add the iron nail
because as current increases
magnetic field also increases( both
are directly proportional)
Decrease the current from the
power supply because as current
decreases magnetic field also
decreases ( both are directly
proportional)
Decrease the current because
magnetic field and current are
inversely proportional.
Increase the current, and add the
iron nail.

Expert Solution

Step 1

Take a iron nail and copper wire , some of the copper wire is wrapped around the nail in direction and remaining wire wrapped in opposite in direction ,their free ends are connected to power supply such that strength of magnetic field reduces

ie the increases from power supply magnetic field strength is also increases

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