A charge of -3.05 µC is fixed at the center of a compass. Two additional charges
ID: 1686391 • Letter: A
Question
A charge of -3.05 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.093 m. The charges on the circle are -4.3 µC at the position due north and +4.50 µC at the position due east. What are the magnitude and direction of the net electrostatic force acting on the charge at the center? Specify the direction relative to due east.magnitude ___ N
direction ___° ---Select--- south of east north of east
and
Four identical metallic objects carry the following charges: +7.4 µC, +4.2 µC, -7.0 µC, and -4.4 µC. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated.
(a) What is the final charge on each object?
___µC
(b) How many electrons (or protons) make up the final charge on each object?
____ ---Select--- protons electrons
Explanation / Answer
A charge of -3.05 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.093 m. The charges on the circle are -4.3 µC at the position due north and +4.50 µC at the position due east. What are the magnitude and direction of the net electrostatic force acting on the charge at the center? Specify the direction relative to due east. magnitude ___ N the force on the charge at the center due to the charge at north=9*10^9*3.05*4.3*10^-12/0.093*0.093=f1 this will be in the direction in the north. similarly the force on the charge at the center due to the charge at east=9*10^9*3.05*4.5*10^-12/0.093*0.093 in the direction towards east=f2 so the net force will be in the direction of the resultant the angle between f1 and f2 will be 90degree the net force=SQRT[f1*f1+f2*f2] and Four identical metallic objects carry the following charges: +7.4 µC, +4.2 µC, -7.0 µC, and -4.4 µC. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? 7.4+4.3-7-4.4/4=+0.05µC ___µC (b) How many electrons (or protons) make up the final charge on each object? _n*1.6*10^10-19=0.05µC so n=0.05*10^-6/1.6*10^-19__ ---Select--- protons electrons
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