# physics

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A small spherical insulator of mass 1.90 10-2 kg and charge +0.600 µC is hung by a thin wire of negligible mass. A charge of −0.900 µC is held 0.150 m away from the sphere and directly to the right of it, so the wire makes an angle è with the vertical.

Find the angle è.

Find the tension in the wire

• physics -

Again, as above, the horzontal electric force is equal to mg*tanTheta.
Tension= mg*cosTheta
Draw the force diagram to demonstrate this.

• physics -

tension = mg/ cosTheta

• physics -

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