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17. A sinusoidally varying potential difference is applied to an antenna in a radio transmitter (figure 1), resulting in a current in the antenna that varies sinusoidally with time. A de- tector consisting of a light bulb connected to two straight wires is held in the air near the transmitter. transmitter Figure 1: Page 7 of 11 (a) When the detector is held with the wires parallel to the transmitter antenna, the light bulb lights. Explain in detail why this happens, using appropriate diagrams. (b) When the detector is held with the wires perpendicular to the transmitter antenna (fig- ure 2), the light bulb does not light. Explain in detail why it does not light, using ap- propriate diagrams. Figure 2: No light (c) What will happen when the detector is held so its wires are collinear with the antenna, as in figure 3? Explain, using appropriate diagrams. Figure 3:

          17. A sinusoidally varying potential difference is applied to an antenna in a radio transmitter
(figure 1), resulting in a current in the antenna that varies sinusoidally with time. A de-
tector consisting of a light bulb connected to two straight wires is held in the air near the
transmitter.
transmitter
Figure 1:
Page 7 of 11
(a) When the detector is held with the wires parallel to the transmitter antenna, the light
bulb lights. Explain in detail why this happens, using appropriate diagrams.
(b) When the detector is held with the wires perpendicular to the transmitter antenna (fig-
ure 2), the light bulb does not light. Explain in detail why it does not light, using ap-
propriate diagrams.
Figure 2:
No
light
(c) What will happen when the detector is held so its wires are collinear with the antenna,
as in figure 3? Explain, using appropriate diagrams.
Figure 3:

17. A sinusoidally varying potential difference is applied to an antenna in a radio transmitter
(figure 1), resulting in a current in the antenna that varies sinusoidally with time. A de-
tector consisting of a light bulb connected to two straight wires is held in the air near the
transmitter.
transmitter
Figure 1:
Page 7 of 11
(a) When the detector is held with the wires parallel to the transmitter antenna, the light
bulb lights. Explain in detail why this happens, using appropriate diagrams.
(b) When the detector is held with the wires perpendicular to the transmitter antenna (fig-
ure 2), the light bulb does not light. Explain in detail why it does not light, using ap-
propriate diagrams.
Figure 2:
No
light
(c) What will happen when the detector is held so its wires are collinear with the antenna,
as in figure 3? Explain, using appropriate diagrams.
Figure 3:

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