A circuit is arranged as shown in figure. The output voltage V0 is equal to ................... V.
Your Input ________
Answer
Correct Answer is 5
Explanation
As diodes D1 and D2 are in forward bias, so they acted as negligible resistances
$$\Rightarrow$$ Input voltage become zero
$$\Rightarrow$$ Input current is zero
$$\Rightarrow$$ Output current is zero
$$\Rightarrow$$ V0 = 5 volt
2
JEE Main 2021 (Online) 26th August Evening Shift
Numerical
For the given circuit, the power across Zener diode is .............. mW.
Your Input ________
Answer
Correct Answer is 120
Explanation
$$i = {{10V} \over {5k\Omega }}$$ = 2mA
$$I = {{14V} \over {1k\Omega }}$$ = 14 mA
$$\therefore$$ Iz = 12 mA
$$\therefore$$ P = IzVz = 120 mW
3
JEE Main 2021 (Online) 26th August Evening Shift
Numerical
If the maximum value of accelerating potential provided by a ratio frequency oscillator is 12 kV. The number of revolution made by a proton in a cyclotron to achieve one sixth of the speed of light is ...............
[mp = 1.67 $$\times$$ 10$$-$$27 kg, e = 1.6 $$\times$$ 10$$-$$19C, Speed of light = 3 $$\times$$ 108 m/s]
In a semiconductor, the number density of intrinsic charge carries at 27$$^\circ$$C is 1.5 $$\times$$ 1016/m3. If the semiconductor is doped with impurity atom, the hole density increases to 4.5 $$\times$$ 1022/m3. The electron density in the doped semiconductor is ___________ $$\times$$ 109/m3.