Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 72

EASY

NEET

IMPORTANT

Earn 100

The AC voltage across a resistance can be measured using a:

55.56% studentsanswered this correctly

Important Questions on Electromagnetic Induction and Alternating Currents

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 73

The RMS value of emf given by

E = (8 \sin ω t + 6 \cos ω t)

volt is

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 74

In an LR circuit, the value of

L

is

(\frac{0.4}{π}) henry

and the value of

R

is

30 ohm

. If in the circuit, an alternating emf of

200 volts

at

50 cycles per second

is connected, the impedance of the circuit and current will be,

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 75

The rms value of potential difference $V_{0}$ shown in figure is

Question Image

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 76

The output of a dynamo using a split ring commutator is

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 77

A dynamo dissipates

20 W

when it supplies a current of

4 A

through it. If the terminal potential difference is

220 V

, then, calculate the emf produced.

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 78

In the given circuit the peak voltages across $C, L$ and $R$ are $30 V, 110 V$ and $60 V$ respectively. The rms value of the applied voltage is

Question Image

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 79

The frequency of an alternating current is

50 Hz

. What is the minimum time taken by current to reach its peak value from zero value?

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 15 - Electromagnetic Induction and Alternating Currents>Level 1>Q 80

An

A C

current is given by

I = I_{1} s i n ω t + I_{2} c o s ω t .

A hot wire ammeter will give a reading: