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Pete_01
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1. Homework Statement
A thin wooden stick of length 12 cm has a tiny metal sphere
glued to each end. A charge of +3 microC is placed on one
sphere and a charge of -2 microC is placed on the other.
The center of mass is located 7 cm from the positively-
charged sphere. The system is mounted on a fixed
horizontal E-W axle passing through the center of mass
about which the system is free to rotate with no friction.
When the system is then placed in a horizontal uniform
southward electric field of 800 N/C, the resulting
equilibrium position of the system is horizontal with
the positive charge due S of the negative charge.
What amount of torque (about the axle) is required
to hold the system at an angular displacement of 25
degrees away from the equilibrium position?
2. Homework Equations
torque = LqEsin(theta)
3. The Attempt at a Solution
I tired plugging in the values into the equation:
torque = (0.12)(1x10^-6)(800)(sin(25)) but it isn't coming out right. What am I doing wrong?
A thin wooden stick of length 12 cm has a tiny metal sphere
glued to each end. A charge of +3 microC is placed on one
sphere and a charge of -2 microC is placed on the other.
The center of mass is located 7 cm from the positively-
charged sphere. The system is mounted on a fixed
horizontal E-W axle passing through the center of mass
about which the system is free to rotate with no friction.
When the system is then placed in a horizontal uniform
southward electric field of 800 N/C, the resulting
equilibrium position of the system is horizontal with
the positive charge due S of the negative charge.
What amount of torque (about the axle) is required
to hold the system at an angular displacement of 25
degrees away from the equilibrium position?
2. Homework Equations
torque = LqEsin(theta)
3. The Attempt at a Solution
I tired plugging in the values into the equation:
torque = (0.12)(1x10^-6)(800)(sin(25)) but it isn't coming out right. What am I doing wrong?
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