Practice free Electromagnetic Induction (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In which of the following devices, the eddy current effect is not used?
Electric heater does not involve Eddy currents. It uses Joule's heating effect and hence (1) will be the correct answer.
A 800 turn coil of effective area 0.05 is kept perpendicular to a magnetic field . When the plane of the coil is rotated by 90 around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:
A circular ring of radius r is placed in a homogeneous magnetic field perpendicular to the plane of the ring. The field B changes with time according to the equation B = Kt, where K is a constant and t is the time. The electric field in the ring is
A cycle wheel of radius 0.5 m is rotated with a constant angular velocity of 10 rad/s in a region of a magnetic field of 0.1 T which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is:
In a region of uniform magnetic induction B = 10–2 tesla, a circular coil of radius 30 cm and resistance π2 ohm is rotated about an axis that is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is :
Amplitude of
Which of the following describes the fundamental principle of an AC generator?
According to the NCERT text, 'An ac generator converts mechanical energy into electrical energy.' and 'In an ac generator, mechanical energy is converted to electrical energy by virtue of electromagnetic induction.'
What is the primary role of the coil (armature) in an AC generator?
The NCERT text states, 'The rotation of the coil causes the magnetic flux through it to change, so an emf is induced in the coil.'
The angle $\theta$ between the magnetic field vector $\vec{B}$ and the area vector $\vec{A}$ of the coil in an AC generator is given by $\theta = \omega t$. What does $\omega$ represent?
The NCERT text mentions, 'When the coil is rotated with a constant angular speed $\omega$, the angle $\theta$ between the magnetic field vector B and the area vector A of the coil at any instant t is $\theta = \omega t$ (assuming $\theta = 0^{\circ}$ at t = 0).'
The magnetic flux ($\Phi_B$) through a rotating coil in an AC generator at any time $t$ is given by:
From the NCERT text, 'the flux at any time t is $\Phi_B = BA \cos \theta = BA \cos \omega t$'.
What is the instantaneous value of the induced EMF ($\varepsilon$) in an AC generator with $N$ turns, area $A$, magnetic field $B$, and angular speed $\omega$?
The NCERT text states, 'Thus, the instantaneous value of the emf is $\varepsilon = NBA \omega \sin \omega t$ (6.19)'.
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