A Current Carrying Coil as a Magnetic Dipole

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A Current-Carrying Coil as a Magnetic Dipole So far we have examined the magnetic fields produced by current in a long straight wire, a solenoid, and a toroid, We turn our attention here to the field produced by a coil carrying a -current. You saw in Section 29-9 that such a coil behaves as a  magnetic dipole in […]

Solenoids and Toroids

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Solenoids and Toroids Magnetic Field of a Solenoid We now turn our attention to another situation in which Ampere’s law proves useful. It concerns the magnetic field produced by the current in a long, tightly wound helical coil of wire. Such a coil is called a solenoid . We assume that the length of the solenoid is much […]

Ampere’s Law

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Ampere’s Law We can find the net electric field due to any distribution of charges with the inverse square law for the differential field if (Eq. 30-2), but if the distribution is complicated,  we may have to use a computer. Recall, however. that if the istribution has   lanar. cylindrical. or spherical symmetry, we can apply Gauss’ […]

Force Between Two Parallel Currents

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Force Between Two Parallel Currents Two long parallel wires carrying currents exert forces on each other. Figure 30-9 shows two such wires, separated by a distance d and carrying currents io and ib Let us analyze the forces on these wires due to each other. We seek first the force on wire b in  due to the current […]

Calculating the Magnetic Field Due to a Current

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Calculating the Magnetic Field Due0 to a Current As we discussed in Section 29-1, one way to produce a magnetic field is with moving charges-that is, with a current. Our goal in this chapter is to calculate the magnetic field that is produced by a given distribution of currents. We shall use the same basic procedure we used […]

Magnetic Fields Due to Currents

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Magnetic Fields Due to Currents This is the way we presently launch materials into space. However, when we begin mining the Moon and the asteroids, where we will not have a source of fuel for such conventional rockets, we shall need a more effective way.  electromagnetic lunchers may be the answer. A small prototype, the electromagnetic rail gun, can presently accelerate […]