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For a large industrial city with much load variations , the DC generator should be

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Important Questions on Electromagnetic Induction

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

What is a dynamo? Describe an a.c. dynamo under the following headings:

$(iii)$ Working.

MEDIUM

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

What is Dynamo? Draw a labelled diagram and describe the working of an AC dynamo.

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

What is a dynamo? Describe an a.c. dynamo under the following headings:

$(i)$ Principle

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A solid metal cube of edge length

2 cm

is moving in the positive

y

-direction, at a constant speed of

6 m s^{- 1}

. There is a uniform magnetic field of

0 .1 T

in the positive

z

-direction. The potential difference between the two faces of the cube, perpendicular to the

x

-axis, is

MEDIUM

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

The relation in root-mean-square value

(i_{rms})

and peak value

(i_{0})

of alternating current is-

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

10 m

long horizontal wire extends from North East to South West. It is falling with a speed of

5.0 m s^{- 1},

at right angles to the horizontal component of the earth's magnetic field of

0.3 \times 10^{- 4} Wb m^{- 2} .

The value of the induced emf in the wire is:

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

What is a dynamo? Describe an a.c. dynamo under the following headings:

$(ii)$ Labelled diagram

HARD

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A conducting square frame of side

a

and a long straight wire carrying current

I

are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity

V

. The e.m.f induced in the frame (when the centre of the frame is at a distance

x

from the wire) will be proportional to :
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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

In a.c. generator induced emf at $t = 0$ . the induced emf at the time $\frac{π}{ω}$ is_____________.

HARD

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

Draw a neat labeled diagram of an A.C. generator.

HARD

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A circular loop of radius

0.3 cm

lies parallel to a much bigger circular loop of radius

20 cm

. The centre of the small loop is on the axis of the bigger loop. The distance between their centres is

15 cm

. If a current of

2.0 A

flows through the smaller loop, then the flux linked with a bigger loop is:

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

An electric generator is based on_____

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A metallic rod of length $l$ is tied to a string of length $2 l$ and made to rotate with angular speed $ω$ on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the e.m.f. induced across the ends of the rod is:

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HARD

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A conducting loop in the shape of right angled isosceles triangle of height

10 cm

is kept such that the

90^{o}

vertex is very close to an infinitely long conducting wire (see the figure). The wire is electrically insulated from the loop. The hypotenuse of the triangle is parallel to the wire. The current in the triangular loop is in counterclockwise direction and increased at constant rate of

10 A s^{- 1} .

Which of the following statement(s) is (are) true?
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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

When the current in a coil changes from

5 A

2 A

0 .1 s

, an average voltage of

50 V

is produced. The self-inductance of the coil is

MEDIUM

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A uniform magnetic field is restricted within a region of radius,

r .

The magnetic field changes with time at a rate,

\frac{d \vec{B}}{d t}

. Loop one of radius

R > r

encloses the region,

r

and loop two of radius,

R

is outside the region of magnetic field as shown in the figure below. Then the emf generated is

Question Image

MEDIUM

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

A straight conductor of length

0.4 m

is moving with a speed of

7 {ms}^{- 1}

perpendicular to the magnetic field of intensity of

0.9 Wb m^{- 2}

. The induced emf across the conductor will be

EASY

Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

Draw an neat labelled diagram of an a.c. generator.

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

An AC generator consists of a coil of

100

turns and is of cross-sectional area

3 m^{2}

. It is rotating at a constant angular speed of

60 rad s^{- 1}

in a uniform magnetic field of

0.04 T

. Resistance of the coil is

360 Ω

. What is the maximum power dissipation in the coil?

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Physics>Electricity and Magnetism>Electromagnetic Induction>AC Generator

The instantaneous voltage of a

50 Hz

generator giving peak voltage as

300 V .

The generator equation for this voltage is

For a large industrial city with much load variations , the DC generator should be

Important Questions on Electromagnetic Induction

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