|
| |
Back
Figure 1-28.—Magnetic fields around elements | Up
Neets Module 10-Introduction to Wave Propagation, Transmission Lines, and Antennas | Next
SUMMARY |
1-40
Q46. What do we call the field that is created between two rods when a voltage is applied to them?
Q47. When current flows through a conductor, a field is created around the conductor. What do we
call this field?
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.
Q48. 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?
|
