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Three resistors, of resistances 3 Ω, 4 Ω and 6 Ω, and a bulb are connected in a circuit,   as shown below. Initially all the switches, S1, S2 and S3, are open. The internal resistance of the battery and the resistance of the connecting wires may be ignored. 10.1 State Ohm’s law in words. (2) … Read more

A coil with 200 windings and a surface area of 2,8 × 10-3 m is rotated at constant speed   in a constant magnetic field of 2,5 T. An emf of 3,5 V is induced in the coil. 9.1 Consider the following statement: The magnitude of the induced emf across  the ends of a conductor is … Read more

Two small identical metal spheres on insulated stands carry charges of +4,2 × 10-9 C   and -6,8 × 10-9 C respectively. They are placed at a distance of 0,3 m apart. 8.1 State Coulomb’s law in words. (2) 8.2 Calculate the magnitude of the electrostatic force that the one charge exerts on the other. (3) … Read more

An experiment is set up to determine the relationship between the DEGREE OF DIFFRACTION and WAVELENGTH of light. Blue light is passed through a single slit and the pattern formed is observed.  The experiment is now repeated with green light and then with red light. The distance between the light source and the slit remains … Read more

A light ray is incident on a glass prism. The angle of incidence is 38°, as shown below.The refractive index of glass is 1,5 and that of air is 1. 6.1 Define the term angle of refraction. (2) 6.2 Calculate the angle of refraction inside the glass prism. (3) 6.3 Redraw the glass prism in … Read more