Why should wire-wound resistors not be used in RF circuits?
The resistor’s tolerance value would not be adequate
The resistor’s inductance could make circuit performance unpredictable✓Correct answer
The resistor could overheat
The resistor’s internal capacitance would detune the circuit
Explanation
A wire-wound resistor is physically a coil, so it has appreciable series inductance whose reactance grows with frequency and makes the part stop behaving like a pure resistance at RF. Overheating and tolerance are not the issue, since wire-wound resistors are usually the more rugged and precise type.