Physics 2102, March 13, 2011. Activity 1 The gure shows a charged particle which enters a uniform magnetic eld B with speed v0, moves through a half-circle in time To and then leaves the eld (a) Is the charge positive or negative? (b) Is the nal speed of the particle greater than, less than, or the same as v0? (c) If the initial speed had been 0.5v0 would the time spent in the eld have been greater than, the same as, or less than To? ((1) Would the path of this slower particle have been a half-circle, less than a half-circle, or more than a half-circle