Question Video: Identifying the Unit for the Strength of a Magnetic Field | Nagwa Question Video: Identifying the Unit for the Strength of a Magnetic Field | Nagwa

# Question Video: Identifying the Unit for the Strength of a Magnetic Field Physics • Third Year of Secondary School

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Which of the following is the correct unit for the strength of a magnetic field? [A] Watt [B] Joule [C] Coulomb [D] Tesla [E] Newton

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### Video Transcript

Which of the following is the correct unit for the strength of a magnetic field? (A) Watt, (B) joule, (C) coulomb, (D) tesla, (E) newton.

The question asks us what the correct unit for the strength of a magnetic field is. A magnetic field magnitude can be related to some familiar quantities by the equation force equals magnetic field magnitude multiplied by current multiplied by length of wire. We can immediately see that magnetic field magnitude cannot be equal to force, as this is the subject of the formula that has magnetic field magnitude as one of its terms. We can then eliminate the unit newton as this is the unit of force.

Let us consider the remaining options. One option is watt. This is the unit of power, so it cannot be the unit for the strength of a magnetic field. Another option is joule. This is the unit of energy, so it cannot be the unit for the strength of a magnetic field. Another option is coulomb. This is the unit of electric charge, so it cannot be the unit for the strength of a magnetic field. The only remaining option is tesla. This is actually the correct unit for the strength of a magnetic field.

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