Question
please solve both questions: 2 and 3
Assume imagiiude and direction iit, e 2 Harker e that the radius of the clock is 20.0-cm and that the numbers are on the edge of the clock face has of the electric field at the center of the clock face. +2-nC of About what time will it be when the hour hand points in the direction of the electric field? 12 9 4 7 6 2. Cecil wants to calculate the electric field very near the center of the surface of a large metal frisbee that has been uniformly charged on the surface. Derive the electric field at this point (you may assume that the frisbee is infinitely large compared to the height above the frisbee where Cecil is measuring the field. Cecil wants to make a capacitor from two of these giant frisbees. Determine the electric field between two frisbees, one positively charged and one negatively charged. Determine the electric field outside of the two frisbees. Assume uniform surface charge distribution on each and equal magnitude total charges on each. 3. 4. Cecil and Gretta have been working on a Buster launch device cap able of putting Buster into low-Earth orbit The device is currently in the conceptual phase. A prototype has been put together consisting of a unformly locsd in the hack vard (where
Explanation / Answer
2] Let the sueface charge density be sigma.
Make a cylinderical Gaussian surface of radius r and small height h, such that 0.5h is on one side and other 0.5h is on the other side. Since plate is large, field is constant.
Flux through both sides is given by: E*2*pi r^2 = qenclosed/e0 = sigma* pi r ^2/e0
E = sigma/2e0
3] electric field in between = 2 times electric field due to one plate
= 2*sigma/2e0
= sigma/e0
electric field outside the plates = sigma/2e0 - sigma/2e0
= 0
