Directly proportional to the antenna current

Inversely proportional to the antenna current

Directly proportional to the square of the antenna current

Directly proportional to the square root of the antenna current

Field intensity is:

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🔍 Key Concepts

• Relationship between radiated field strength and antenna current in basic radio theory • How power, current, and field intensity relate (think in terms of proportional vs. proportional to the square) • Difference between something being proportional to a value vs. proportional to the square of that value

💭 Think About

• If you double the antenna current, what happens to the field intensity according to each of the options? Work through each choice logically. • Think about how radiated power from an antenna changes with current. Then, how does field intensity (E-field at some distance) relate to that power? • Compare this to familiar electrical relationships: for a resistor, how does power relate to current? Is field intensity more like current itself, voltage, or power?

✅ Before You Answer

• Be clear on the difference between field intensity (E-field strength) and power (Poynting vector / watts). They are not the same quantity. • Check the mathematical form: when a quantity is said to be directly proportional, doubling one exactly doubles the other. For square relationships, doubling one causes a factor of four change in the other. • Verify which quantity in antenna theory is proportional to I, and which is proportional to I² (current squared).

🔍 Key Concepts

💭 Think About

✅ Before You Answer