Question

Three point charges+1, nC, +2 nC and -3 nC are placed in two adjacent vertices and in the center of a square with 3 m long sides. Find electric field (magnitude and direction) and electric potential (magnitude and sign) in the empty vertices of the square. Find total potential energy of the interaction between the charges. Find force of interaction between the charges in the vertices. Find DC currents (magnitudes and directions) in the resistors of the circuit shown. Find total electric power of this circuit. Neglect internal resistances of the batteries. Find voltage between the points A and B. A transformer decreases voltage from 220 V to 12 V. The secondary current is 50 A. The secondary coil of the transformer has 18 turns. Find power developed in the primary and secondary coils and the number of turns in the primary coil. A square metal frame of resistance 10 ohm is pushed with a force of 20 N into a homogenous magnetic field of 2 T with a constant speed of 20 m/s. What is size of this frame if the current generated in it is 5 mA? An optical system is made of converging and diverging lenses with focal distances 12.5 mm und 54 mm respectively. How large is the final mage of a 7 mm object placed at a distance of 23 mm from the converging lens? The distance between the lenses is 66 mm. Plot the images formed by two lenses in scale on the drawing below and compare the calculated values (image sizes and image distances) with those on the drawing. Find total magnification of the optical system.

Answer 1