Need help solving these questions. No points rewarded if there is no explanation

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Need help solving these questions. No points rewarded if there is no explanation

The following information is relevant to the next three questions. A charged ball with mass .0010 kg hangs from a string at equilibrium in a uniform electric field (magnitude = 200 N/C) as shown in the diagram. One end of the string is fixed to a vertical wall, and it hangs at an angle 0 = 40 degree relative to vertical. What is the sign of the net charge on the ball? positive negative not enough information is given to determine the sign What is the magnitude of the net charge on the ball? The mass of the string is negligible. 1 mu C = 10-6 C 980 mu C 580 mu C 58 mu C 41 mu C You would need to know the length of the string to solve this problem. Suppose the ball in the above problem is a solid copper sphere. What is the magnitude of the electric field at the center of the ball? 10 N/C 1000 N/C 200 N/C zero You would need to know the radius of the ball to answer this

Explanation / Answer

6) positive charge

7) Tcos(theta)= mg

    Tsin(theta)= qE

hence, q= mg*tan(theta)/E = 0.001* 9.8*tan(40)/200= 41uC

ans d

8) D. zero

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