A straight conductor carries a current I and is split into a circular loop of radius r as shown in Fig. The magnetic field at the center O of the circle is
Correct answer: D. Zero
- A. μoI/2r
- B. μoI/ϗr
- C. μoI/2ϗr
- D. Zero
Explanation
If we have two wires, the magnetic field created by the first wire will equal the magnetic field created by the second wire. However, the direction of the magnetic field created by the first wire will be opposite to the direction of the magnetic field created by the second wire. At the midpoint between the two wires, the two magnetic fields will cancel each other out, resulting in a magnetic field of zero.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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