Tiêu đề SAMPLE PAPER(2025) -3.pdf ✅

Page 4 Sample Paper 03 CBSE Physics Class 12 SECTION-C 22. Give the physical significance of electric field. 23. Applying Biot-Savart’s law deduce the expression for the magnetic field at the centre of a semicircular loop of radius R carrying current I . 24. Draw path of rays for astronomical telescope in normal adjustment. 25. In a typical nuclear reaction, e.g., H H He n . 1 2 1 2 2 3 0 3 27 $ 1 + + + MeV although number of nucleons is conserved, yet energy is released. How? Explain. 26. Why is the classical Rutherford model for an atom of electron orbiting around the nucleus not able to explain the atomic structure? 27. State Malus law. Draw a graph showing the dependence of intensity of transmitted light on the angle between polariser and analyser. O What will be the effect on interference fringes obtained in Young’s double slit experiment if (1) one slit is covered, (2) a source of light of higher wavelength is used, (3) distance between two slits be increased to 1 cm and (4) distance between screen and double slit is increased? 28. Draw energy band diagram of n-typed and p-typed semiconductor at temperature T 2 0 K. Mark the donar and acceptor energy level with their energies. SECTION-D 29. Net electric flux through a cube is the sum of fluxes through its six faces. Consider a cube as shown in figure, having sides of length L = 10.0 cm. The electric field is uniform, has a magnitude E = 4.00 × 103 NC–1 and is parallel to the xy plane at an angle of 37° measured from the +x -axis towards the +y-axis.