The frequency of A.C. mains in India is 
 

Important Questions on Electromagnetic Induction

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MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 230

E.m.f. is given by, $e=200\sin 50\mathrm{t}$. The r.m.s. value of current (in Ampere) in a circuit of resistance $50 \mathrm{\Omega }$ is
 

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 231

The peak value of an alternating $\mathrm{e}.\mathrm{m}.\mathrm{f}.$ given by $\mathrm{e}={\mathrm{e}}_0\cos \omega \mathrm{t}$ is $10 \mathrm{V}$ and its frequency is $50 \mathrm{Hz}$. At time $t=\frac{1}{600} \mathrm{s},$ the instantaneous $\mathrm{e}.\mathrm{m}.\mathrm{f}.$ is.... 

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 232

In an $\mathrm{A}.\mathrm{C}.$ circuit, $I=100\sin \left(200\pi t\right)$. The time required for the current to achieve its peak value will be:
 

MEDIUM

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 233

An A.C. ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the A.C. ammeter reads $3 \mathrm{A}$. When another alternating current passes through the circuit, the A.C. ammeter reads $4 \mathrm{A}$. Then the reading of this ammeter, if D.C. and A.C. flow through the circuit simultaneously is
 

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 234

The $A.C.$ meter measure its-

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 235

An A.C. source is connected to a resistive circuit. Which of the following is true?

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MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 236

Voltage and current in an AC circuit are given by $V=5\sin \left(100\mathrm{\pi }t-\frac{\mathrm{\pi }}{6}\right)$ and $I=4\sin \left(100\mathrm{\pi }t+\frac{\mathrm{\pi }}{6}\right)$.

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MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 237

The effective value of current in a $50$ cycle $AC$ circuit is $5.0 \mathrm{A}$. What is the value of the current after $\frac{1}{300} \mathrm{s}$, if current is $I=I_0\sin \omega t$?