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11.◆-2 points SerCP11 16.2·P021.My Notes Ask Your TeacherA tiny sphere of mass 7.20 mg and charge-2.80 nC is initially at a distance of 1.64 μm from a fixed charge of +8.45 nC.(a) If the 7.20-mg sphere is released from rest, find its kinetic energy when it is 0.500 μm from the fixed charge(b) If the 7.20-mg sphere is released from rest, find its speed when it is 0.500 μm from the fixed charge.m/sNeed Help? ReadItSubmit Answer Save ProgressPractice Another Version

Question
11.
◆-2 points SerCP11 16.2·P021.
My Notes Ask Your Teacher
A tiny sphere of mass 7.20 mg and charge-2.80 nC is initially at a distance of 1.64 μm from a fixed charge of +8.45 nC.
(a) If the 7.20-mg sphere is released from rest, find its kinetic energy when it is 0.500 μm from the fixed charge
(b) If the 7.20-mg sphere is released from rest, find its speed when it is 0.500 μm from the fixed charge.
m/s
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Submit Answer Save Progress
Practice Another Version
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11. ◆-2 points SerCP11 16.2·P021. My Notes Ask Your Teacher A tiny sphere of mass 7.20 mg and charge-2.80 nC is initially at a distance of 1.64 μm from a fixed charge of +8.45 nC. (a) If the 7.20-mg sphere is released from rest, find its kinetic energy when it is 0.500 μm from the fixed charge (b) If the 7.20-mg sphere is released from rest, find its speed when it is 0.500 μm from the fixed charge. m/s Need Help? ReadIt Submit Answer Save Progress Practice Another Version

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Step 1

a) Given,

mass of sphere, m=7.20 mg

Converting mg in to kg, mass m= 7.20*10-6 kg

Sphere charge, q=-2.80nC = -2.8*10-9C

Distance, d1=1.64*10-6m

Fixed charge, Q = 8.45*10-9C

Kinetic energy and velocity to be measured at distance, d2=0.50*10-6m

 

Step 2

From the law of conservation of energy,

KE1- Initial Kinetic Energy

PE1- Initial Potential Energy

KE2- Final Kinetic Energy

PE2- Final Potential Energy 

 

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Step 3

As tiny sphere charge is initially at rest. ...

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