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Two plane circular coils $P$ and $Q$ have radii $r_{1}$ and $r_{2}$ , respectively, $(r_{1} < < r_{2})$ and are coaxial as shown in fig. The number of turns in $P$ and $Q$ , are respectively $N_{1}$ and $N_{2}$ . If current in coil $Q$ is varied steadily at a rate $x$ ampere per second then the induced emf in the coil $P$ will be approximately

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Important Questions on Magnetic Effect of Current and Electromagnetic Induction

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 28

A conducting rod $AB$ of length $l = 1 m$ is moving at a velocity $v = 4 m s^{- 1}$ making an angle $30 °$ with its length. A uniform magnetic field $B = 2 T$ exists in a direction perpendicular to the plane of motion. Then

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 29

The horizontal component of the earth's magnetic field is

3 \times 10^{- 5} Wb m^{- 2}

. The magnetic flux linked with a coil of area

1 m^{2}

, and having

5

turns, whose plane is normal to the horizontal will be

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 30

The north pole of a magnet is brought near a coil. The induced current in the coil as seen by an observer on the side of magnet will be

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 31

The self-inductance of a coil is

2 H

. The current in the coil changes from

8 A

2.95 A

0.01 s

. The time constant of the coil will be

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 32

Area of a coil is

0.16 m^{2}

. If the magnetic field through it changes from

0.1 Wb m^{- 2}

0.5 Wb m^{- 2}

0.02 s

, then the emf induced in the coil will be

EASY

KVPY Aptitude Test - Stream SA

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 33

Which of the following quantities is increased in a step-down transformer?

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KVPY Aptitude Test - Stream SA

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 34

If in a coil rate of change of area is

5 m^{2} / milli \sec

and current becomes

1 amp

from

2 amp

2 \times 10^{- 3} \sec

. If magnetic field is

1

T

, then self-inductance of the coil is

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Practice Book for KVPY Aptitude Test - Stream SA Physics>Chapter 16 - Magnetic Effect of Current and Electromagnetic Induction>Exercise 1>Q 35

An electron is moving near to a conducting loop then the induced current in the loop is-

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Two plane circular coils P and Q have radii r1 and r2, respectively, r1<<r2 and are coaxial as shown in fig. The number of turns in P and Q, are respectively N1 and N2. If current in coil Q is varied steadily at a rate x ampere per second then the induced emf in the coil P will be approximately

Important Questions on Magnetic Effect of Current and Electromagnetic Induction

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