GATE IN 2012 Question Paper (12-Feb-2012) (Shift-2)

Light of wavelength 630 nm in vacuum, falling normally on a biological specimen of thickness 10 $\mu$ m, splits into two beams that are polarized at right angles. The refractive index of the tissue for the two polarizations are 1.32 and 1.333. When the two beams emerge, they are out of phase by

The responsivity of the PIN photodiode shown is 0.9 A/W. To obtain $V_{out}$ of -1 V for an incident optical power of 1 mW, the value of $R$ to be used is

A periodic voltage waveform observed on an oscilloscope across a load is shown. A permanent magnet moving coil (PMMC) meter connected across the same load reads

For the circuit shown in the figure, the voltage and current expressions are

$v(t)=E_1\sin (\omega t)+E_3\sin (3\omega t)$ and $i(t)=I_1\sin (\omega t-{\varphi }_1)+I_3\sin (3\omega t-{\varphi }_3)+I_5\sin (5\omega t)$.

The average power measured by the Wattmeter is

The bridge method commonly used for finding mutual inductance is