Class Management Help 5.1-5.3 Begin Date: 1/1/2018 12:01:00 AM -- Due Date: 1/17

Question

Class Management Help 5.1-5.3 Begin Date: 1/1/2018 12:01:00 AM -- Due Date: 1/17/2018 11:00:00 AM End Date: 4/27/2018 11:00:00 AM (10%) Problem 7: A positively charged particle Q1 45 nC is held fixed at the origin. A second charge Q2 of mass m 5.5 g Is floating a distance d= 35 cm above charge Q/. The net force on Q2 is equal to zero. You may assume this system is close to the surface of the Earth Q2 ©theexpertta.com 25% Part (a) Which of the following represents the free-body diagram of charge Q2? 25% Part (b) What is the sign of the charge on Q2? 25% Part (c) Write an equation for the magnitude of charge Q2 in terms of the given variables Final Grade 95% Correct Answer Student Answer Grade Detail Correct Student Feedback Final Answer Credit 100% Submission Historv Totals 5% 0% 5% Answer Hints Feedback 0% 0% 0% 25% Part (d) Calculate the magnitude of Q2 in units of nanocoulombs 5% 0% 5% 0% 0% 0% Note: Feedback not accessed. IQ2I = ( m g d2 )/( k Q1 ) Totals |

Explanation / Answer

b) since weight acts downwards , and the net force on Q2 is zero

so it will have elecric force in upward direction which means it will have +ve-charge

c) Weight = electric force

mg = kq1q2 / d^2

d) 5.5*10^-6 * 9.8 = 9*10^9*45*10^-9*Q2 / 0.35^2

Q2 = 1.63*10^-8 C

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