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Combined Electric and Magnetic Fields

The generator, shown in figure 1-30, provides the voltage, which creates an electric field, and current, which creates a magnetic field. This source voltage and current build up to maximum values in one direction during one half-cycle, and then build up to maximum values in the other direction during the next half-cycle. Both the electric and magnetic fields alternate from minimum through maximum values in synchronization with the changing voltage and current. The electric and magnetic fields reach their maximum intensity a quarter-cycle apart. These fields form the induction field. Since the current and voltage that produce these E and H fields are 90 degrees out of phase, the fields will also be 90 degrees out of phase.

Figure 1-30. - Relationship of E-lines, and current flow.

Q.48 An induction field is created around a conductor when current flows through it. What do we call the field that detaches itself from the conductor and travels through space?