Recent questions and answers in Electromagnetic Induction

Two coaxial solenoids are made by winding their insulated wire over a pipe of cross sectional area $A= 10\;cm^2$ length $20\;cm$ .One of the solenoids has 200 turns and another 400 turns. the mutual inductance is .

answered Mar 27, 2014 by meena.p

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Two induction coil of inductance $L_1$ and $L_2$ are separated by a considerable distance. On connectivity them in series the equivalent inductance is

answered Mar 27, 2014 by meena.p

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A circular loop of radius R, carrying current I lies in $X-Y$ plane with its centre at origin. The total magnetic flux through $X-Y$ plane is

answered Mar 27, 2014 by meena.p

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When a wire loop is rotated in a magnetic field, the direction of induced emf

answered Mar 26, 2014 by meena.p

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A magnet is dropped inside a long hollow vertical metal pipe. During the fall the acceleration of magnet.

answered Mar 26, 2014 by meena.p

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The current flowing in two coaxial coils is in the same direction. If we increase the distance between the two , the electric current will,

answered Mar 26, 2014 by meena.p

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A conducting ring of radius R is placed in a magnetic field perpendicular to the plane of the coil at the rate of $\beta$ . Then Which one is correct ?

answered Mar 26, 2014 by meena.p

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A thin semicircular ring of radius 'a' is falling with its plane vertical to a horizontal magnetic field induction $\overrightarrow {B}$ .At the given position PQR the speed of ring is 'v' , the potential difference developed across the ring.

answered Mar 26, 2014 by meena.p

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A coil of inductance $L= 150\;mH$ and resistance $R= 70\;m \Omega$ is connected to a voltage source. How soon will the voltage attain $50\%$ of initial value

answered Mar 25, 2014 by meena.p

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A conducting rod of length $l=2\;cm$ moves with velocity 12 m/s at an angle $30^{\circ}$ to a magnetic field produced between two square faced poles of side 2 cm. If flux leaving the face is $5 \mu Wb$ the induces emf is

answered Mar 25, 2014 by meena.p

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A 1200 turn coil of mean area $500 \;cm^2$ is held perpendicular to a uniform field of $4 \times 10^{-4}$ tesla. The resistance of coil is $20 \Omega$ . What will be the average induced current when coil turns through $180^{\circ}$ in $0.1\;$ second?

answered Mar 25, 2014 by meena.p

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A fully charge capacitor C either initial charge q is connected to a coil of self inductance. L at $t=0$ the time at which the energy is stored equally between electric and magnetic field is

answered Mar 25, 2014 by meena.p

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A metal rod of resistance $20 \;\Omega$ is fixed along the diameter of a conducting ring of radius $0.1 m$ . A magnetic field of $B=50T$ acts perpendicular to the plane The ring rotates with an angular velocity of $w=20\;rad/s$ about its axis . An external resistance of $10 \;\Omega$ is connected across center and rim of the ring. What is current through the external resistance.

answered Mar 24, 2014 by meena.p

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In the circuit given the switch is closed at time $t=0$ What is the amount of charge passing through the battery in are time constant ?

answered Mar 24, 2014 by meena.p

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In the given circuit shown : $L= 200\;mH;$ Emp of battery $E= 12 V$ $R_1=R_2=2 \Omega$ the internal resistance of battrey is negligible . The potential drop across the inductance L after time t.

answered Mar 24, 2014 by meena.p

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A emf of 10V is applied in a circuit containing inductance L and resistance R. $L=5H$ and $R= 10 \;\Omega$ . The ratio of current at $t =\infty$ and $t= 1\;s$ in

answered Mar 24, 2014 by meena.p

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A coil of inductance $84\;mH$ and resistance $8 \Omega$ is connected to $12 V$ battery. The current in the coil is 1 A at approximately

answered Mar 24, 2014 by meena.p

1 answer