MCQ
Light wave is travelling along y-direction. If the corresponding $\vec E$ vector at any time is along the $x-$axis, the direction of $\vec B$ vector at that time is along


- A$y-$axis
- B$x-$axis
- C$+ z$-axis
- ✓$-z$ axis

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$(A)$ $I =\frac{V_0 t}{\pi \rho} \ln \left(\frac{R_2}{R_1}\right)$
$(B)$ the outer surface is at a higher voltage than the inner surface
$(C)$ the outer surface is at a lower voltage than the inner surface
$(D)$ $\Delta V \propto I ^2$


$A.$ It is a heavily doped p-n junction.
$B.$ It emits light only when it is forward biased.
$C.$ It emits light only when it is reverse biased.
$D.$ The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.
Choose the correct answer from the options given below :
