I Review | Constants A at, circular, steel loop of radius 75 cm is at rest in a uniform magnetic field, as shown in an edgeon view in 1 (Elgute I). The eld is changing with time, according to B (t) = (1.4T) 8403575 )t. Figure 1 of1 60 V Part A Find the emf induced in the loop as a function of time (assume t is in seconds). Express your answer in volts in terms of the variable t. .AZcp-hoo? R_equest Answer V Part B When is the induced emf equal to % of its initial value? Express your answer in seconds. I'D/EAE'DW A loop of wire is at the edge of a region of space containing a uniform magnetic field B. The plane of the loop is perpendicular to the magnetic field. Now the loop is pulled out of this region in such a way that the area A of the coil inside the magnetic field region is decreasing at the constant rate c. That is, -C, with c > 0. Figure Part A The induced emf in the loop is measured to be V. What is the magnitude B of the magnetic field that the loop was in? Express your answer in terms of some or all of the variables A, c, and V. View Available Hint(s) ? Submit Part B For the case of a square loop of side length L being pulled out of the magnetic field with constant speed (see the figure), what is the rate of change of area c = - ? (Figure 1) Express your answer in terms of L and v. View Available Hint(s) IVO ? Submit