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Physics 102 Notes c

# Physics 102 Notes c - COM ED4 11 P PR EM Physics 102 FORM 0...

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Physics 102 FORM 0 [l] Two charges, Qi and Q 2) are separated by a certain distance R. If the magnitudes of the charges are doubled, and their separation is also doubled, then what happens to the electrical force between these charges? t it remains the same [B] It is doubled [C] It is halved It is quadrupled [E] It decreases by a factor of 4 [2] The electric potential at x = 2.00 m is +400 V, and at z = 10.0 m is -2000 V. What is the magnitude and direction of the electric field? [A] 200 V/m in the -z direction ([B))300 V/m in the +x direction [C] 400 V/m in the +x direction [D] 600 V/m in the -z direction [E] 800 V/m in the +x direction i [3] The potential difference between the plates of a parallel plate capacitor is 40 V, and the electric field between the plates has a strength of 800 V/m. If the plate area is 0.020 m 2 , what is the capacitance of this capacitor? [A] 5.7 x 10~ 14 F [B] 5.3 x 1Q- 13 F /[CJ)3.5 x 10~ 12 F [D] 9.1 x lO" 11 F [E] 2.1 x 10- 9 F ^-^ [4] The length of a certain wire is doubled while the radius is halved. What is the change in the resistance of this wire? [A] It stays the same. [B] It is reduced by a factor of 2. § It is increased by a factor of 4. [D] It is reduced by a factor of 6. It is increased by a factor of 8. [5] A 5.0 /zF capacitor is connected in series with a 3.0 kfl resistor across a 20-V DC source and an open switch. If the switch is closed at t = 0.0 s, what is the charge on the capacitor at t = 12 ms? § 0 C [B] 37% of the maximum charge [C] 45% of the maximum charge 55% of the maximum charge [E] 67% of the maximum charge [6] A policeman pulls you over for running a red (A = 700 nm) light. You claim before the judge that, before you stopped, the light appeared green (A = 550 nm). How fast would you need to be moving toward the light for this to be true? Assume that the nonrelativistic expression on the formulae sheet is still valid. [A] 0.12c fli])0.27c [C] 0.39c [D] 0.52c [E] 0.78c [7] Arrange the following forms of electromagnetic radiation in order of INCREASING energy _per photon. ([A} radio, microwaves, infrared, visible, x-rays, gamma rays [B] radio, microwaves, infrared, visible, gamma rays, x-rays [C] microwaves, radio, infrared, visible, x-rays, gamma rays [D] radio, microwaves, visible, infrared, x-rays, gamma rays [E] gamma rays, x-rays, visible, infrared, radio, microwaves PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO M P

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Physics 102 FORM 0 [8] If you separately measure -E rms and B iras of an electromagnetic wave, how can these two quantities be combined to form a quantity that is proportional to the average intensity?
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