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7 problems tagged with Current in Magnetic Field in Magnetism
P0937
Beginner Electromagnetism › MagnetismDirection of Current, Field, or Force
Each diagram in Figure shows a current-carrying wire placed in a magnetic field, with two of the three quantities (current $I$, magnetic flux density $B$, and Ampere force $F$) indicated. Determine the direction of the third quantity in each case.
- Left diagram: $F$ points upward and $B$ points to the right. Find the direction of $I$.
- Middle diagram: $I$ points into the page ($\otimes$) and $F$ points to the right. Find the direction of $B$.
- Right diagram: $I$ points into the page ($\otimes$) and $B$ points to the right. Find the direction of $F$.
P0938
Beginner Electromagnetism › MagnetismRotation of Current Coils in Uniform Field
Figure shows three current-carrying coils placed in a uniform magnetic field $\vec{B}$. For each coil, determine how it will rotate and the orientation of its rotation axis.
- Left diagram: A rectangular coil lies with its plane perpendicular to $\vec{B}$ (which points out of the page), with current $I$ circulating as shown. Describe its motion.
- Middle diagram: A rectangular coil lies with its plane perpendicular to $\vec{B}$ (which points into the page), with current $I$ circulating as shown. Describe its motion.
- Right diagram: A rectangular coil lies with its plane parallel to $\vec{B}$ (which points upward in the plane of the coil), with current $I$ circulating as shown. Describe its motion.
P0939
Beginner Electromagnetism › MagnetismCurrent Loop Between Permanent Magnet Poles
As shown in Figure, a current-carrying loop is placed in the uniform field between the poles of a permanent magnet.
- In figure (a), with the N pole on the left and the S pole on the right, describe how the coil rotates.
- In figure (b), the coil rotates clockwise when viewed from above. Identify which side of the magnet is the N pole and which is the S pole.
- In figure (c), with the S pole on the left and the N pole on the right, the coil rotates counterclockwise when viewed from above. Determine the direction of the current circulating in the coil.
P0945
Beginner Electromagnetism › MagnetismTorque on a Tilted Circular Coil
A small circular coil of $N = 20$ turns and radius $r = 4$ cm is placed in a uniform magnetic field of magnitude $B = 0.050$ T. The normal to the coil plane makes a $60^{\circ}$ angle with $\vec{B}$. The coil carries a current $I = 3$ A. Find the torque on the coil.
P0946
Beginner Electromagnetism › MagnetismTorque on a Rectangular Coil About Edge
A rectangular coil is wound from $N = 50$ turns of insulated fine wire; its sides are $10$ cm and $5$ cm long, and it carries a current $I = 0.10$ A. The coil can rotate about one of its sides, $OO'$ (see Figure 14.34). A uniform external magnetic field of magnitude $B = 0.050$ T is applied so that $\vec{B}$ makes a $30^{\circ}$ angle with the plane of the coil. Find the torque on the coil.
P0947
Beginner Electromagnetism › MagnetismMoving-Coil Galvanometer Torque and Spring
The coil of a moving-coil galvanometer is $2.0$ cm long and $1.0$ cm wide, has $N = 250$ turns, and lies in a magnetic field $B = 0.2$ T (in the radial gap between the poles). When a current $I = 0.10$ mA flows, the coil deflects by $\varphi = 30^{\circ}$.
- Find the magnetic torque acting on the coil.
- Find the torsion constant of the spiral spring.
P0948
Beginner Electromagnetism › MagnetismFactors Affecting Moving-Coil Galvanometer Sensitivity
For a given current through a galvanometer, the larger the pointer's deflection angle, the higher the sensitivity. Analyze qualitatively which factors influence the sensitivity of a moving-coil galvanometer.
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