Evaluate the net force on a existing loop in an outside magnetic fieldEvaluate the network torque top top a existing loop in an outside magnetic fieldDefine the magnetic dipole minute of a existing loop


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Motors are the most common application of magnetic force on current-carrying wires. Electric motors contain loops of wire in a magnetic field. When present is passed through the loops, the magnetic field exerts talk on the loops, i beg your pardon rotates a shaft. Electrical energy is converted into mechanical job-related in the process. Once the loop’s surface ar area is aligned v the magnetic field, the direction of present is reversed, so over there is a constant torque ~ above the loop ((Figure)). This reversal that the existing is done with commutators and also brushes. The commutator is collection to turning back the present flow at set points to keep regular motion in the motor. A straightforward commutator has three contact locations to avoid and dead spots where the loop would have zero instantaneous talk at the point. The brushes press against the commutator, producing electrical contact between parts the the commutator during the spinning motion.


A streamlined version the a dc electrical motor. (a) The rectangular wire loop is put in a magnetic field. The forces on the wires closest to the magnetic poles (N and S) are opposite in direction as determined by the right-hand rule-1. Therefore, the loop has actually a network torque and rotates to the position shown in (b). (b) The brushes now touch the commutator segment so that no existing flows with the loop. No torque acts upon the loop, yet the loop proceeds to spin native the early velocity provided to it in component (a). By the time the loop flips over, current flows v the wires again yet now in the opposite direction, and also the procedure repeats as in part (a). This reasons continual rotation that the loop.


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The magnetic pressure on a straight current-carrying cable of size l is given by
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motor (dc)loop of cable in a magnetic field; when present is passed with the loops, the magnetic ar exerts talk on the loops, which rotates a shaft; electric energy is converted into mechanical occupational in the process