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Zorluk: KolayFundamentals of Electromagnetism and Induction

An electromagnet is constructed by winding insulated copper wire around a soft iron core. Which of the following modifications will increase the strength of the magnetic field generated by this electromagnet?

  1. A
    Reversing the direction of current flow through the coil
  2. Increasing the electric current flowing through the coilCevap
  3. C
    Replacing the iron core with a non-magnetic plastic core
  4. D
    Maintaining a high voltage across an open circuit in the coil

Cevap

Increasing the electric current flowing through the coil
The magnetic field strength of an electromagnet depends directly on the magnitude of the electric current flowing through the windings, the number of wire turns, and the permeability of the core material. Increasing the current directly increases the magnetic flux density.

Adım Adım Çözüm

1
Identify the factors determining the magnetic field strength of an electromagnet
The field strength of a solenoid or electromagnet depends directly on the electric current, the number of coil turns, and the magnetic permeability of the core.
Electromagnetic flux density is directly proportional to ampere-turns (I×NI \times N) and core permeability.
2
Evaluate the proposed modification against the operational formula
Raising the current (II) increases the total magnetomotive force (MMF=N⋅IMMF = N \cdot I), thereby producing a stronger magnetic field.
Greater electron movement generates more concentric magnetic lines of force around each loop of wire.

Anahtar Kavram

The strength of an electromagnet's magnetic field is directly proportional to the magnitude of current flowing through its windings.
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Fundamentals of Electromagnetism and Induction

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