When the frequency of the applied voltage decreases in a parallel RL circuit:

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. the phase angle becomes less negative
  2. Zeq increases
  3. Zeq decreases
  4. both (1) and (2)

Answer (Detailed Solution Below)

Option 2 : Zeq increases
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Detailed Solution

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Concept:

Admittance is defined as a measure of how easily a circuit or device will allow current to flow through it.

Admittance is the reciprocal (inverse) of impedance, akin to how conductance and resistance are related.

In parallel circuits to calculate equivalent admittance conductance and susceptance are added.

For parallel RL circuit equivalent admittance;

Y = G - jB

where;

Y → Admittance (1/Z)

G→ Conductance(1/R)

B→ Susceptance (1/ωL)

Analysis:

If;

Frequency (f) of applied voltage decreases → ω↓  → XL  → B → Y→ Z 

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