List of top Physics Questions on Alternating current asked in MHT CET

A resistance of $100\ \Omega$, inductor of self-inductance $\left(\dfrac{4}{\pi^2}\right)\ \text{H}$ and a capacitor of unknown capacitance are connected in series to an a.c. source of $200\ \text{V}$ and $50\ \text{Hz}$. When the current and voltage are in phase, the capacitance and power dissipated respectively are

In an LCR circuit, inductive reactance is $30\ \Omega$ and capacitive reactance is $30\ \Omega$. The resistance is found to be $40\ \Omega$. The probable impedance of the combination is

The density of a metal at normal pressure \( P \) is \( \rho \). When it is subjected to an excess pressure, the density becomes \( \rho' \). If \( K \) is the bulk modulus of the metal, then the ratio \( \frac{\rho'}{\rho} \) is

An ammeter of resistance 20 \( \Omega \) gives full scale deflection when 1 mA current flows through it. What is the maximum current that can be measured by connecting 4 resistors each of 16 \( \Omega \) in parallel with the meter?

An alternating e.m.f. is given by \( e = e_0 \sin \omega t \). In what time the e.m.f. will have half its maximum value, if \( e_0 \) starts from zero? (T = Time period)

In a capacitive circuit, the reactance of capacitor at frequency \( f \) is \( X_C \). What will be its reactance at frequency \( 2f \)?

An ideal transformer converts $220\, V$ a.c. to $3.3\, kV$ a.c. to transmit a power of $4.4\, kW$. If primary coil has $600$ turns, then alternating current in secondary coil is

An alternating voltage $e = 200 \sqrt{2} \, \sin(100 \, t)$ volt is connected to $1\, \mu F$ capacitor through AC ammeter. The reading of ammeter is

Alternating current of peak value $\left(\frac{2}{\pi}\right)$ ampere flows through the primary coil of the transformer. The coefficient of mutual inductance between primary and secondary coil is 1 henry. The peak e.m.f. induced in secondary coil is (Frequency of $AC = 50\, Hz$)

Average power in the $ L-C-R $ circuit depends upon

ln an AC circuit, the current lags behind the voltage by $\pi$/3. The components of the circuit are

In series L-C-R circuit, the capacitance is changed from C to 2C. The inductance should be changed from L to ... to obtain same resonance frequency.