A boy is playing with the empty rim of a cycle wheel of radius 40 cm by rolling it along a horizontal road towards north with angular speed of $20 \mathrm{rad} \mathrm{s}^{-1}$. Considering the effect of magnetic field of earth, the e.m.f induced in the rim is
(Horizontal component of earth's magnetic field $=0.26 \mathrm{G}$ )
In an ideal step up transformer, if the input voltage and input power are $V_1$ and $R_1$ respectively and the output voltage and output power are $V_2$ and $P_2$ respectively, then
The correct statement among the following is
The additional energy that should be given to an electron to reduce its de-Broglie wavelength from 1 nm to 0.5 nm is
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