Question

The phase angle between the network voltage and induced voltage

Answer 1

Answer:

Any change in current in a coil (either a rise or a fall) causes a corresponding change of the magnetic flux around the coil. Because the current changes at its maximum rate when it is going through its zero value at 90° (point b on Figure 1) and 270° (point d), the flux change is also the greatest at those times.

Any change in current in a coil (either a rise or a fall) causes a corresponding change of the magnetic flux around the coil. Because the current changes at its maximum rate when it is going through its zero value at 90° (point b on Figure 1) and 270° (point d), the flux change is also the greatest at those times.Consequently, the self-induced EMF (electromagnetic field) in the coil is at its maximum (or minimum) value at these points, as shown in Figure 1.

Any change in current in a coil (either a rise or a fall) causes a corresponding change of the magnetic flux around the coil. Because the current changes at its maximum rate when it is going through its zero value at 90° (point b on Figure 1) and 270° (point d), the flux change is also the greatest at those times.Consequently, the self-induced EMF (electromagnetic field) in the coil is at its maximum (or minimum) value at these points, as shown in Figure 1.Because the current is not changing at the point when it is going through its peak value at 0° (point a), 180° (point c), and 360° (point e), the flux change is zero at those times. Therefore, the selfinduced EMF in the coil is at its zero value at these points.

Any change in current in a coil (either a rise or a fall) causes a corresponding change of the magnetic flux around the coil. Because the current changes at its maximum rate when it is going through its zero value at 90° (point b on Figure 1) and 270° (point d), the flux change is also the greatest at those times.Consequently, the self-induced EMF (electromagnetic field) in the coil is at its maximum (or minimum) value at these points, as shown in Figure 1.Because the current is not changing at the point when it is going through its peak value at 0° (point a), 180° (point c), and 360° (point e), the flux change is zero at those times. Therefore, the selfinduced EMF in the coil is at its zero value at these points.Figure 1 - Current, Self-Induced EMF, and

According to Lenz’s Law, the induced voltage always opposes the change in current. Referring to Figure 1, with the current at its maximum negative value (point a), the induced EMF is at a zero value and falling. Thus, when the current rises in a positive direction (point a to point c), the induced EMF is of opposite polarity to the applied voltage and opposes the rise in current.

According to Lenz’s Law, the induced voltage always opposes the change in current. Referring to Figure 1, with the current at its maximum negative value (point a), the induced EMF is at a zero value and falling. Thus, when the current rises in a positive direction (point a to point c), the induced EMF is of opposite polarity to the applied voltage and opposes the rise in current.Notice that as the current passes through its zero value (point b) the induced voltage reaches its maximum negative value.