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
- ✓
- B
- C
- D
Answer: A.
View full solution →Question types
Electromagnetic Induction question types
356 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.
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Sample Questions
Electromagnetic Induction questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
A conducting rod of length $2l$ is rotating with constant angular speed $w$ about its perpendicular bisector. A uniform magnetic field $\vec{B}$ exists parallel to the axis of rotation. The $e.m.f.$ induced between two ends of the rod is
- A$B \omega^{l^2}$
- B$\frac{1}{2} B \omega^{l^2}$
- C$\frac{1}{8} B \omega^{l^2}$
- ✓Zero
Answer: D.
View full solution →Assertion : A metal piece and a non-metal (stone) piece are dropped from the same height near earth’s surface. Both will reach the earth’s surface simultaneously.
Reason : There is no effect of earth’s magnetic field on freely falling body.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
Reason : There is no effect of earth’s magnetic field on freely falling body.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
In a region of uniform magnetic induction $B=10^{-2}$, Tesla a circular coil of radius $30 \ cm$ and resistance $\pi^2$ ohm is rotated about an axis which 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
- A$4 \pi^2\ mA$
- B$30\ mA$
- ✓$6\ mA$
- D$200\ mA$
Answer: C.
View full solution →An inductor, $L$ a resistance $R$ and two identical bulbs $,\mathrm{B}_1$ and $\mathrm{B}_2$ are connected to a battery through a switch $S$ as shown in the figure. The resistance $R$ is the same as that of the coil that makes $L .$ Which of the following statements gives the correct description of the happenings when the switch $S$ is closed
- AThe bulb $B_2$ lights up earlier than $B_1$ and finally both the bulbs shine equally bright
- B$B_1$ light up earlier and finally both the bulbs acquire equal brightness
- ✓$B_2$ lights up earlier and finally $B_1$ shines brighter than $B_{2}$
- D$B_1$ and $B_2$ light up together with equal brightness all the time
Answer: C.
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