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Recent questions tagged class-12

Figure shows a metal rod PQ resting on the smooth rail AB and positioned between the poles of a permanent magnet. The rail, the rod and the magnetic field are in three mutual perpendicular directions. A galvanometer G connects the rails through a switch K. Length of the rod = 15 cm, B = 0.50 T, resistance of the closed loop containing the rod = $9.0 m \Omega$. Assume the field to be uniform.

Suppose K is open and the rod is moved with a speed of 12cm/s in the direction shown. Give the polarity and magnitude of the induced $emf$.

asked Dec 31, 2016 by priyanka.c

1 answer

A rectangular wire loop of slides $8 \;cm$ and $2\;cm$ with a small cut is moving out of a region of uniform field of magnitude $0.3T$ directed normal to the loop. What is the $emf$ developed across the cut if the velocity of the loop is $1\;cm/s$ in a direction normal to the shorter side of the loop. For how long does induced voltage last in each case.

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

If $\log \sqrt {x^2+y^2}=\tan ^{-1} \bigg( \large\frac{x}{y} \bigg)$, then show that $\large\frac{dy}{dx}=\frac{y-x}{y+x}$

asked Mar 20, 2015 by meena.p

1 answer

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