JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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The magnetic potential energy stored in a certain induction is

\mathrm{25}{\mkern 1mu} {\mkern 1mu} \,mJ

, when the current in the inductors is

\mathrm{60}{\mkern 1mu} {\mkern 1mu} mA

. This inductors is of inductance

View answer and explanation

Correct option: A

\mathrm{13}\mathrm{.89}\,\,\mathrm{H}

Option A (

\mathrm{98 }\,\mathrm{cm}

) is correct because the distance between the lenses in a Galilean telescope in normal adjustment is the difference between the focal lengths of the objective and eyepiece.

More Questions from ELECTRO MAGNETIC INDUCTION

Practice All Chapter MCQs →

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