JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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A rectangular, a square, a circular and an elliptical loop, all in the

\left( {x - y} \right)

plane, are moving out of a uniform magnetic field with a constant velocity

\vec V = v\vec i

. The magnetic field is directed along the negative

z

-axis direction. The induced

emf

, during the passage of these loops, out of the field region, will not remain constant for

View answer and explanation

Correct option: B

The circular and the elliptical loops

Option B is correct because the induced emf will not remain constant for the circular and elliptical loops due to the changing rate of area leaving the magnetic field.

More Questions from ELECTRO MAGNETIC INDUCTION

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The current in a long solenoid of radius

R

and having

n

turns per unit length is given by

i=i_0 \sin \omega t

. A coil having

N

turns is wound around it near the centre. Find the induced emf in the coil. The induced emf can be produced in a coil by

A. moving the coil with uniform speed inside
uniform magnetic field

B. moving the coil with non uniform speed inside
uniform magnetic field

C. rotating the coil inside the uniform magnetic
field

D. changing the area of the coil inside the uniform
magnetic field

Choose the correct answer from the options given
below: An inductance coil have the time constant

4 \mathrm{sec}

, if it is cut into two equal parts and connected parallel then new time constant of the circuit- If the coils of a transformer are made up of thick wire, then A loop of area

0.1\,\,{m^2}

rotates with a speed of

\mathrm{60}

rps perpendicular to a magnetic field of

\mathrm{0}\mathrm{.4}\,\,\mathrm{T}

. If there are

\mathrm{100}

turns in the loop, maximum voltage induced in the loop is A

\mathrm{50}\,\,\mathrm{mH}

coil carries a current of

\mathrm{2 A}

, the energy stored in joule is