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Questions >> CBSE XII >> Physics >> Electromagnetic induction

A current vs time graph of the current passing through a solenoid is shown in the fig. For which time in the back electromotive force (u) a maximum? If the back emf at t=3s is e, find the back emf at t = 7s. OA, AB and BC are straight line segments.

asked Dec 29, 2016 by suganyadevi.p

1 answer

Predict the direction of induced current in the situation described above.

asked Dec 29, 2016 by priyanka.c

1 answer

Predict the direction of induced current in the situation described above.

asked Dec 29, 2016 by priyanka.c

1 answer

Find the current in the wine PQ for the configuration as shown in the fig. Wire PQ has negligible resistance. B, the magnetic field is coming out of the paper. $\theta$ is a fixed angle made by PQ travelling smoothly over two conducting parallel wires separated by a distance d.

asked Dec 29, 2016 by suganyadevi.p

1 answer

Consider a closed loop C in a magnetic field as shown in the fig. The flex passing through the loop is defined by choosing a surface whose edge coincides with the loop and using the formula $\phi = B_1 . dA_1 + B_2 . dA_2 + ...........$ Now if we choose two different surfaces $S_1$ and $S_2$ having C as their edge, would we get the same answer for flex. Justify.

asked Dec 29, 2016 by suganyadevi.p

1 answer

Consider a metallic pipe with an inner radius of 1cm. If a cylindrical bar magnet of radius 0.8 cm is dropped through the pipe, it takes more time to come down than it takes for a similar unmagnetised cylindrical iron bar dropped through the metallic pipe. Explain.

asked Dec 29, 2016 by suganyadevi.p

1 answer

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c$ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the frequency of $\gamma$

asked Aug 17, 2016 by meena.p

1 answer

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c$ cos $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the amplitude of the magnetic field part of the wave ?

asked Aug 17, 2016 by meena.p

1 answer

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