NEET Physics Kotaby Prashant Sir

Alternating Current for NEET

Class 12 · What NEET asks, the NCERT lines it repeats, and where to study it free

Alternating Current in NEET: the numbers

80NEET / AIPMT questions in our PYQ bank (1992–2026)
30exam years with a question from this chapter
6NCERT lines NEET asked more than once

Topics NEET asks most

TopicQuestions
Series LCR circuit and resonance 35
AC voltage applied to R, L and C 20
Transformers 15
Power in AC circuits 10

NCERT lines NEET asked again and again

Read these lines from your NCERT book twice: NEET has built questions on each of them more than once.

Meters and mains ratings quote the rms value , so the peak is larger: iₘ = √2 I . A 200 V rms supply peaks near 283 V.
AIPMT 1994NEET 2022NEET 2022
In a pure inductor current lags voltage by π/2 ; in a pure capacitor current leads . Neither one uses up energy over a full cycle.
NEET 2016NEET 2022NEET 2024
X_L = ωL is zero for DC, so a coil is just a wire; X_C = 1/ωC is infinite for DC. So a capacitor blocks DC but passes AC.
AIPMT 2001NEET 2019NEET 2022
At resonance X_L = X_C, so ω₀ = 1/√LC , impedance is minimum (Z = R), current is maximum and phase difference is zero .
AIPMT 1994AIPMT 2007NEET 2022
Average power is P = VI cos φ , with cos φ = R/Z. It is largest in a purely resistive circuit and zero for ideal L or C.
AIPMT 2006NEET 2016NEET 2023
An ideal transformer has Vₛ/Vₚ = Nₛ/Nₚ and keeps the frequency. With a DC input there is no induced emf , so the output is zero.
NEET 2013NEET 2021NEET 2024

Free lecture by Prashant Sir

Alternating Current in ONE SHOT | NEET Physics Crash Course | Class 12 Physics NCERT | NEET 2023 · 25,315 views on YouTube

Free NCERT notes for Alternating Current

How resistors, inductors and capacitors behave with sinusoidal voltage, series LCR resonance, AC power and transformers. NEET usually asks one or two questions from it, mostly quick numericals on reactance, impedance, resonance and power factor.

Read the chapter notes: key NCERT points, graphs, every formula with its meaning, tricks, common mistakes and NEET traps.

FAQ

How many questions come from Alternating Current in NEET?

Our bank of NEET and AIPMT papers (1992–2026) has 80 questions from Alternating Current, most of them from Series LCR circuit and resonance, AC voltage applied to R, L and C, Transformers.

Which NCERT line of Alternating Current has NEET asked the most?

This line has been asked 3 times in NEET/AIPMT: "Meters and mains ratings quote the rms value, so the peak is larger: iₘ = √2 I. A 200 V rms supply peaks near 283 V."

Where can I study Alternating Current for NEET for free?

Prashant Sir's full lecture is free on the NEET Physics Kota YouTube channel, and the chapter notes are free on Dhruv.