In flash photography, the energy used to make the flash is stored in a capacitor, which consists of two closely spaced conductors that carry opposite charges. If the amount of charge on the conductors is doubled, by what factor does the stored energy increase? (i)√2; (ii) 2; (iii) 2√2; (iv) 4; (v) 8.
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In flash photography, the energy used to
make the flash is stored in a capacitor,
which consists of two closely spaced conductors
that carry opposite charges. If the amount
of charge on the conductors is doubled, by
what factor does the stored energy increase?
(i)√2; (ii) 2; (iii) 2√2; (iv) 4; (v) 8.
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- #87: The flash unit in a camera uses a special circuit to “step up” the 3.0 V from the batteries to 300 V, which charges a capacitor. The capacitor is then discharged through a flashlamp. The discharge takes 10 ms, and the average power dissipated in the flashlamp is 105 W. What is the capacitance of the capacitor?For problem 25 part b, calculate the potential at point P in volts using a value of Q2=-3.17 Q1 instead of the value in the stated problem. Answer in 5 sig figs!!The plates of an air-filled parallel-plate capacitor are 3.20 mm apart, and each has an area of 3.80 cm^2. The capacitor is connected to a 6.00 V battery. Calculate: (a)the capacitance; (b) the charge stored on the plates; (c) the magnitude of the electric field between the plates (d) the stored energy.
- An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. If a 17.8-V potential difference is applied to these plates, calculate the following. (a) the electric field between the plates; magnitude and direction (b) the capacitance (c) the charge on each plate(a) Find the equivalent capacitance between points a and b for the group of capacitors connected as shown in the figure above. Take C1 = 2.00 µF, C2 = 14.0 µF, and C3 = 6.00 µF.(b) What charge is stored on C3 if the potential difference between points a and b is 60.0 V?How much work is done (by a battery, generator, or some other source of potential difference) in moving Avogadro's number of electrons from an initial point where the electric potential is 9.10 V to a point where the electric potential is -7.60 V? (The potential in each case is measured relative to a common reference point.) MJ Need Help? Watch It
- ertices of a fig a express it in vects Q. 3: (a) Given Ci=2.0µF, C2=4.0µF, C3=6.0µF and C4-8.0µF (i) Find equivalent capacitance. (ii) How much energy is stored in capacitor C2? C1 H C3 12.0 V wiw ndThe electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of an 690-μF capacitor is 440 V. (a) Determine the energy that is used to produce the flash in this unit. (b) Assuming that the flash lasts for 4.8 ms, find the effective power or "wattage" of the flash. (a) Number i Units (b) Number i Units >If a proton gains 6x10^-12 J of electrical potential energy as it moves from point A to point B, what is the voltage difference between points A and B, and which point is at the higher potential?
- 11 of 35 > A potential difference exists between the inner and outer surfaces of the membrane of a cell. The inner surface is negative relative to the outer surface. If 1.25 x 10-20 J of work is required to eject a positive sodium ion (Na+) from the interior of the cell, what is the magnitude of the potential difference between the inner and outer surfaces of the cell? magnitude of the potential difference:In the figure a potential difference V = 97.0 V is applied across a capacitor arrangement with capacitances C1 = 12.7 µF, C2 = 6.58 µF, and C3 = 3.45 µF. What are (f) U1 for capacitor 1 (In units of Joules) , and (g) q2 (units of UC) , (h) V2? ( units of V)