DQ5C_solution - Discussion Question 5C P212, Week 5...

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Discussion Question 5C P212, Week 5 Designing a Capacitor 1 A capacitor is nothing more than two conducting objects (called terminals ) that are separated by an insulating medium. If we attach a battery to such an object, a charge +Q will accumulate on one of the plates, and an equal and opposite charge –Q will accumulate on the other. That’s the purpose of a capacitor: it’s a device to store charge. Knowing that helps us remember the formula for capacitance, C = Q / Δ V a “ big ” capacitor (large C ) can store a lot of charge with little voltage. Let’s build one! Two large circular plates made of metal have area A = 2 m 2 . They are arranged parallel to each other and are separated by a distance d = 1.5 cm. The gap between the plates is filled with air. Together, the plates form a parallel-plate capacitor . (a) Where do the charges go? 1. Place a charge + Q on one terminal and a charge – Q on the other. Write down the surface charge densities, σ i and σ o , for the inner and outer surfaces of each plate.
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DQ5C_solution - Discussion Question 5C P212, Week 5...

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