Questions
Question 1
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State the magnetic flux through a flat surface in a uniform magnetic field.
Question 2
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What is the SI unit of magnetic flux?
Question 3
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What direction is the area vector for a flat surface?
Question 4
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A \(0.30\,\mathrm{m^2}\) loop is perpendicular to a \(0.40\,\mathrm{T}\) field. Find the flux.
Question 5
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A \(0.50\,\mathrm{m^2}\) loop has area vector at \(60^\circ\) to a \(0.20\,\mathrm{T}\) field. Find the flux.
Question 6
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When is magnetic flux through a flat loop zero?
Question 7
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A loop has area \(0.25\,\mathrm{m^2}\) and flux \(0.10\,\mathrm{Wb}\) when perpendicular to the field. Find \(B\).
Question 8
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A \(0.10\,\mathrm{m^2}\) coil in a \(0.80\,\mathrm{T}\) field has flux \(0.040\,\mathrm{Wb}\). Find the angle between \(\vec B\) and the area vector.
Question 9
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What is the net magnetic flux through any closed surface?
Question 10
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Why does the net magnetic flux through a closed surface vanish?
Question 11
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A flat loop is rotated from maximum positive flux to maximum negative flux in the same uniform field. What is the change in flux?
Question 12
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A surface is parallel to the magnetic field lines. Is the flux through that surface maximum or zero?
Question 13
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A square loop has side \(0.20\,\mathrm{m}\) in a \(0.50\,\mathrm{T}\) field. Its area vector is \(37^\circ\) from the field. Find \(\Phi_B\).
Question 14
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A coil has \(N\) identical turns. What is the flux linkage for uniform flux \(\Phi_B\) through each turn?
Question 15
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Why can magnetic flux be negative even though field strength and area are positive?
Question 16
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A closed surface encloses a bar magnet. What is the net magnetic flux through the surface?
Question 17
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A magnetic field is nonuniform over a surface. Why is \(BA\cos\theta\) not generally enough?
Question 18
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Two surfaces have the same area in the same uniform field. One has twice the flux of the other. What can you infer about their orientations?
Question 19
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Explain why changing only the sign convention for the area vector changes the sign of flux but not the physical field.
Question 20
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Use magnetic flux to state the difference between a magnetic field with no monopoles and an electric field with enclosed charge.