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Q. An airtight box has a removable lid of area 1 multiplied by 10-2 m2 and negligible weight. The box is taken up a mountain where air pressure outside the box is 0.70 multiplied by 105 Pa. The inside of the box is totally evacuated. What is the magnitude of force required to pull the lid off the box?

Q. A parallel-plate capacitor is formed from two 4 electrodes spaced 1.20 mm apart. The electric field strength inside the capacitor is 1.29x 10^6. What is the charge (in nC) on each electrode?

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