Purpose of Antenna: Receiving Electromagnetic Waves

[kukumaluboy]

Homework Statement

An antenna in RECEIVING mode is a device that

(a) convert electric field to magnetic field
(b) convert high freq current to electromagnetic waves
(c) convert magnetic field to electric field
(d) convert electromagnetic waves to high freq current

(MARK OUT ALL THAT APPLY)

The Attempt at a Solution

My answer was C and D.

But teacher marked me wrong and said the answer was B. Why? I tot transmitting was Current to EM waves. SO receiving should be Em waves to Current rite? And can explain to me about the elec field and magnetic field. Does the antenna convert it?

 

[Ouabache]

Electromagnetic waves (EM waves) are comprised of both electric and magnetic field components. So your teacher is right in discounting answers that discuss conversion from one to another of those fields. However I agree with you, that a receiving antenna converts EM waves to current. EM waves impinge upon the antenna and when the receive switch is turned on, this energy couples into an electric circuit (radio receiver) inducing current to flow. Perhaps you can ask your teacher to explain the reasoning behind her/his answer.

 

[berkeman]

Homework Statement

An antenna in RECEIVING mode is a device that

(a) convert electric field to magnetic field
(b) convert high freq current to electromagnetic waves
(c) convert magnetic field to electric field
(d) convert electromagnetic waves to high freq current

(MARK OUT ALL THAT APPLY)

The Attempt at a Solution

My answer was C and D.

But teacher marked me wrong and said the answer was B. Why? I tot transmitting was Current to EM waves. SO receiving should be Em waves to Current rite? And can explain to me about the elec field and magnetic field. Does the antenna convert it?

I agree with Ouabache. (b) is TX and (d) is RX. The teacher just had a small oopsie.

 

[kukumaluboy]

OK thanks solved. He did mark it wrongly.