# 3 Lecture

## PHY301

### Midterm & Final Term Short Notes

## Inductance in parallel

Inductors are passive circuit components that store energy in the form of a magnetic field. They are widely used in various electronic circuits to filter out unwanted signals and to create resonant circuits.

**Important Mcq's**

Midterm & Finalterm Prepration

Past papers included

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**10 mcqs for 'Inductance in Parallel' with a solution and multiple options**

In a parallel inductance circuit, how does the total inductance change as more inductors are added?

a) Increases

b) Decreases

c) Remains the same

**Answer: b) Decreases**

**What is the formula for calculating the total inductance of inductors in parallel?**

a) Ltotal = L1 + L2

b) Ltotal = L1 x L2

c) Ltotal = L1 / L2

**Answer: a) Ltotal = L1 + L2**

**How does the current divide between inductors in a parallel inductance circuit?**

a) Equally

b) According to their individual impedances

c) Inversely proportional to their inductances

**Answer: b) According to their individual impedances**

**In a parallel inductance circuit, what is the phase difference between the current and voltage across an inductor?**

a) 0 degrees

b) 45 degrees

c) 90 degrees

**Answer: c) 90 degrees**

**How does the addition of a capacitor affect the impedance in a parallel inductance circuit?**

a) Increases the impedance

b) Decreases the impedance

c) Does not affect the impedance

**Answer: b) Decreases the impedance**

**Can the total inductance of inductors in parallel ever be greater than the value of the individual inductors?**

a) Yes

b) No

**Answer: b) No**

**How does the inductance in a parallel circuit change as the frequency increases?**

a) Increases

b) Decreases

c) Remains the same

**Answer: b) Decreases**

**What is the formula for calculating the equivalent impedance of inductors in parallel?**

a) Z = Z1 + Z2

b) Z = Z1 x Z2

c) Z = 1/(1/Z1 + 1/Z2)

**Answer: c) Z = 1/(1/Z1 + 1/Z2)**

**What is the advantage of using inductors in parallel in a circuit?**

a) Increases the overall inductance

b) Decreases the current handling capacity

c) Increases the current handling capacity while decreasing the overall inductance

**Answer: c) Increases the current handling capacity while decreasing the overall inductance**

**In a parallel inductance circuit, what is the relationship between the impedance and the frequency?**

a) Impedance increases as frequency increases

b) Impedance decreases as frequency increases

c) Impedance remains the same as frequency increases

**Answer: b) Impedance decreases as frequency increases**

**Subjective Short Notes**

Midterm & Finalterm Prepration

Past papers included

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**What is inductance in parallel?**

**Answer:** Inductance in parallel refers to a circuit configuration where two or more inductors are connected across the same voltage source in parallel, such that the voltage across each inductor is the same.

**What happens to the total inductance of a circuit when inductors are connected in parallel?**

**Answer: **The total inductance of a circuit decreases when inductors are connected in parallel.

**How can you calculate the total inductance of a circuit with inductors in parallel?**

**Answer:** The total inductance of a circuit with inductors in parallel can be calculated using the formula: 1/L(total) = 1/L(1) + 1/L(2) + ... + 1/L(n), where L(1), L(2), ... L(n) are the individual inductances.

**What is the unit of inductance?**

**Answer:** The unit of inductance is Henry (H).

**What is the effect of increasing the number of inductors in parallel on the total current in the circuit?**

**Answer:** Increasing the number of inductors in parallel increases the total current in the circuit.

**What is the phase relationship between the voltage and current in an inductor in parallel?**

**Answer:** The voltage and current in an inductor in parallel are out of phase, with the current lagging behind the voltage by 90 degrees.

**What is the effect of increasing the frequency of the input signal on the total inductance of a circuit with inductors in parallel?**

**Answer:** Increasing the frequency of the input signal decreases the total inductance of the circuit with inductors in parallel.

**How can you increase the total inductance of a circuit with inductors in parallel?**

**Answer: **The total inductance of a circuit with inductors in parallel can be increased by adding more inductors in parallel.

**What is the effect of adding a resistor in parallel to a circuit with inductors in parallel?**

**Answer: **Adding a resistor in parallel to a circuit with inductors in parallel decreases the overall impedance of the circuit.

**What is the difference between inductance in parallel and inductance in series?**

**Answer:** Inductance in parallel refers to the configuration where two or more inductors are connected across the same voltage source in parallel, while inductance in series refers to the configuration where two or more inductors are connected end-to-end, such that the same current flows through each inductor.