Physics 2nd Paper CQ-Cumilla Board-2019

প্রশ্ন ·সময় ১ ঘণ্টা ৪০ মিনিট

1. A student arranged two coils co-axially as in the figure below. When there is a current flow in first coil only then he got the magnetic field of 9.42×104 T 9.42 \times 10^{-4} \mathrm{~T} at the center of the coil. He took the number of turns of 2nd  2^{\text {nd }} coil 450 . After that same current is flown through both the coils and a charge of 80C 80 \mathrm{C} is moved with a velocity of 10 ms1 10 \mathrm{~ms}^{-1} along the diameter of the coil.

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

2. A bi-convex lens of 25 cm 25 \mathrm{~cm} focal length and same radius of curvature was made in a lens manufacturing factory. Whose refractive index is 1.6. Then it is used as a mannifying glass in medium of refractive index of 1.16,1.33 1.16,1.33 and 1.4 respectively.

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

3. In Young's double slit experiment the distance between two slits is 0.4 mm 0.4 \mathrm{~mm} and the distance of screen is 1 m 1 \mathrm{~m} . If the light of wavelength of 3100A˚ 3100 \AA is passed through the slit then 12 bright fringes are seen on screen in both right and left side from the center of the screen. If the distance between two slits is decreased, the change of fringe on screen is observed.

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

4. There are two resistances of 60Ω 60 \Omega each are added with the electric source of 120 V 120 \mathrm{~V} as series circuit. Later on those two resistances are added in parallel to each other and then added with same source.

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

5. In above circuit C1 C_{1} and C2 C_{2} are two parallel plate capacitors. The distance between two plates and the capacitance of both capacitor are 0.5 cm 0.5 \mathrm{~cm} and 600PF 600 \mathrm{PF} respectively. Later on the capacitor C1 C_{1} is filled up with paper (k=3.5) (\mathrm{k}=3.5) and a plate similar to the parallel plate is placed exactly in the middle of the capacitor C2 \mathrm{C}_{2} .

ϵ0=8.85×1012C2 N1M2 \epsilon_{0}=8.85 \times 10^{-12} \mathrm{C}^{2} \mathrm{~N}^{-1} \mathrm{M}^{-2} \text {. }

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

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