A uniform magnetic field of induction B is confined to a cylindrical region of radius R . The magnetic field is increasing at a constant rate of d B d t . A negative charge of magnitude e is placed at point P on the periphery of the field. Its acceleration is

1 2 e R m d B d t towards right

MEDIUM

JEE Main

IMPORTANT

Earn 100

The current graph for resonance in $LC$ circuit is

50% studentsanswered this correctly

Important Questions on Electromagnetic Induction and Alternating Currents

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 35

A high impedance A.C voltmeter is connected in turn across the inductor, the capacitor and the resistor in a series circuit having an A.C source of

100 V (rms)

and gives the same reading in volts in each case. This reading is:

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 36

In the given figure, which voltmeter will read zero voltage at resonant frequency?

Question Image

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 37

An LCR series circuit with

100 Ω

resistance is connected to an AC source of

200 V

and angular frequency

300

radians per second. When only the capacitance is removed, the current lags the voltage by

60 ° .

When only the inductance is removed, the current leads the voltage by

60 ° .

Then the current and power dissipated in LCR circuit are respectively

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 38

In the given LCR circuit, the readings of voltmeter and ammeter will, respectively, be?

Question Image

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 39

Power factor of an

L - R

series circuit is

0.6

. and that of a

C - R

series circuit is

0.5

. If the element (

L, C

and

R

) of the two circuits are joined in series the power factor of this circuit is found to be

1

. The ratio of the resistance in the

L - R

circuit to the resistance in the

C - R

circuit is

\frac{\sqrt{x}}{4}

, find the value of

x

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 41

A sinusoidal voltage

V_{0} \sin ω t

is applied across a series combination of resistance

R

and inductor

L

. The amplitude of the wattless current in this circuit is:

HARD

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 2>Q 42

A uniform magnetic field of induction $B$ is confined to a cylindrical region of radius $R$ . The magnetic field is increasing at a constant rate of $\frac{d B}{d t}$ . A negative charge of magnitude $e$ is placed at point $P$ on the periphery of the field. Its acceleration is

Question Image

MEDIUM

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 16 - Electromagnetic Induction and Alternating Currents>Level 3>Q 22

A C

circuit drawing power from a source of angular frequency

50 {rads}^{- 1}

has a power factor of

0.6 .

In this condition, a resistance of

100 Ω

is present and the current is lagging behind the voltage. If a capacitor is connected in series, then the required capacitance (in

μ F

)that will result in a power factor of unity is :

The current graph for resonance in LC circuit is

Important Questions on Electromagnetic Induction and Alternating Currents

Learn and Prepare for any exam you want !

The current graph for resonance in $LC$ circuit is