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    • https://phys.libretexts.org/Courses/Berea_College/Introductory_Physics%3A_Berea_College/21%3A_The_Magnetic_Force/21.06%3A_Applications
      A needle is attached to the coil, and the deflection of the needle, proportional to the current in the coil, is then a measure of the current through the coil. Once the coil has reached a position whe...A needle is attached to the coil, and the deflection of the needle, proportional to the current in the coil, is then a measure of the current through the coil. Once the coil has reached a position where its magnetic dipole moment vector is parallel to the magnetic field, the direction of the current is reversed, so that the coil continues to feel a torque for another half turn, until the direction of the current is reversed again.

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