Physics 2nd Paper CQ-Jessore Board-2023

State the 1st law of Kirchhoff.

What do you mean by the specific resistance of copper is $1.56 \times 10^{-8} \Omega \mathrm{m}$ ?

Calculate the value of electric current flowing through $1 \Omega$ resistance.

What steps will be taken to measure $30 \mathrm{~A}$ electric current? Verify mathematically.

What is electric dipole?

The internal energy increases during the adiabatic contraction-Explain.

Calculate the initial efficiency of the engine.

What steps will be taken to get the efficiency $60 \%$ of that engine? Explain mathematically.

What is p-type semiconductor?

The resistance of the semiconductor decreases with the increase of temperature-Explain it.

Calculate the current amplification factor of the transistor.

Is it possible to get voltage gain 120 from the circuit of the stem? Verify mathematically.

What is the efficiency of an engine?

Why the electric intensity is zero at the center of a charged sphere?

Calculate the electric potential at the point ' $\mathrm{P}$ ' in the stem.

In the figure, ' $\mathrm{O}$ ' is the midpoint of the dipole. If line $\mathrm{OP}$ makes $0^{\circ} \& 90^{\circ}$ angles with the $\mathrm{OB}$ respectively, what will be changed of electric intensity at the point 'P'?

What is coherent source?

What do you mean by the half life of Radon is 3.82 day?

What is the angular 'displacement of the $10^{\text {th }}$ bright fringe on the screen?

What difference will be occurred if the spacing between two slits is kept half of its previous value? Analyze mathematically.