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Q. An object placed on an equal-arm balance scale requires 12 kg to balance it. When ths object is placed on a spring scale, the spring scale reads 12 kg. What would be the readings of this object of the balance scale and the spring scale (respectively) on the moon? (The acceleration due to gravity on the moon is 1/6th that of Earth's.)

Q. How strong is the electric field between the plates of a 0.70 air-gap capacitor if they are 2.0 apart and each has a charge of 68.

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