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Figure shows a conducting loop placed in a magnetic field. The flux through the loop changes due to change in magnetic field according to the equation $ϕ = 5 t - 10 t^{2} .$ What is the direction and magnitude of induced current at, $t = 0.25 s ?$

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Important Questions on Electromagnetic Induction

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 6

A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is :-

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 7

A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at

t = 0

and completely emerges out at

t = T \sec

. The current in the ring varies as

HARD

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 8

The magnitude of the earth's magnetic field at a place is

B_{0}

and angle of dip is

δ

. A horizontal conductor of length

l

lying along magnetic north-south moves eastwards with a velocity

v

. The emf induced across the conductor is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 9

A simple pendulum with bob of mass $m$ and conducting wire of length $L$ swings under gravity through an angle $θ$ . The earth's magnetic field component in the direction perpendicular to swing is $B$ . Maximum potential difference induced across the pendulum is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 10

Two parallel rails of a railway track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is

1 m

. A train is travelling with a velocity of

72 km h^{- 1}

along the track. The reading of the millivoltmeter (in

mV

) is (vertical component of the earth's magnetic induction is

2 \times 10^{- 5} T

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 11

A helicopter rises vertically with a speed of

100 m s^{- 1}

If helicopter has length

10 m

and horizontal component of earth's magnetic field is

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

then the induced emf between the tip of nose and tail of helicopter is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 12

A ring made of insulating material is rolling without slipping on a horizontal surface with a velocity of center of mass

V_{0} .

A conducting wire of length

2 R

(

R =

radius of the ring) is fixed between two points of the circumference. At an instant, the wire is in a vertical position as shown in the figure. A uniform magnetic field,

B

exists perpendicular to the plane of the ring. The magnitude of emf induced between the ends of the wire is,

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 13

The figure shows an

L

-shaped rod rotating about its end

O

in a plane perpendicular to a magnetic field

B .

The part

O A

of rod is non conducting while

A B

is conducting the emf induced between

A

and

B

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Figure shows a conducting loop placed in a magnetic field. The flux through the loop changes due to change in magnetic field according to the equation ϕ=5t-10t2. What is the direction and magnitude of induced current at, t=0.25 s?

Important Questions on Electromagnetic Induction

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Figure shows a conducting loop placed in a magnetic field. The flux through the loop changes due to change in magnetic field according to the equation $ϕ = 5 t - 10 t^{2} .$ What is the direction and magnitude of induced current at, $t = 0.25 s ?$