4. If the area of the coil is 6920 cm2 and magnetic field applied is increasing uniformly from 0.3 T to 1.6 T, determine the time taken to produce induced emf of -1.2 V. (PAST YEAR PHY098 2019) Answer: 0.75 s Additional Question 1. A square loop of wire of resistance R= 1.3 0 and length 5.2 cm on each side is entering a uniform magnetic field from left to right as in Figure 3. (TEST 02 PHY098 2017) O O Bout Figure 3 Situation A O Situation B O O Situation C Determine the direction of the induced current on the coil; 1) As in situation A. As in situation B. iii) As in situation C. 1. A cube of edge length 1 = 2.5 cm is positioned as shown in Figure P20.7. There is a uniform magnetic field throughout the region with components Bx = +5.0 T, By = +4.0 T and Bz = +3.0 T. Figure P20.7 (a) Calculate the flux through the shaded face of the cube. Answer: 3.1 10-3 Tm2 (b) What is the total flux emerging from the volume enclosed by the cube (i.e., the total flux through all six faces)? Answer: Zero