the one tive that best completes the statement or answers the question. alterna
ID: 1564188 • Letter: T
Question
the one tive that best completes the statement or answers the question. alterna mirror. The magnification of the image is -3.0. Colaod 12 om in front of a curved ED 24 cm length of C) 36 cm D) 16 cm BU 12 cm much charge must pass by apoint in 15sfor the current to be 20 A? D) 1.3 C is in a uniform magnetic field of 0.20 T. What is the magni tude of the prolon angnetic force on the proton? O32 10-20 N E 32 10.2 IN At a certain point in space there is a pot of 400 V. What is the potential energy of a +2 uC charge at that point in space? A) 400 J so x 10-6 J 8 10 D) 800 E 200 5 field due a A current flowing in a long, straight wire is suT point P, a certain distance away from the wire. How far is this point from the center of the wire? A) 2 cm B) 3 cm C) 4 cm D) 5 cm 6) An AC cuit has a 100. ohm resistor in series with a 49 uF capacitor and a 700. mH inductor. At what frequency does the circuit act like a pure resistance? A) 19 mhz B) 12. mHz DO 0.29 M E) 86. Hz The capacitive reactance of a 4-HF capacitor in an ac circuit is 6.0 x 102 o. What is the frequency of the applied signal? A) 17 Hz C) 80 Hz D) 800 Hz E) 6.0 Hz 8) Two 40.0 resistors are connected in parallel, and this combination is connected in series with 300. What is the effective resistance of this combination? A) 7.00 CO 8.00 9 The secondary coil of a neon sign transformer provides 7500. V at 0.010 A. The primary coil operates on 120 V. What current does the primary draw? A) 333. mA 625x 10-4 0.16 A E) 0.625 AExplanation / Answer
here,
the object distance , do = 12 cm
magnification , m = -3
(-di/do) = -3
di = 3 * do ....(1)
let the focal length be f
using the mirror formula
1/f = 1/di + 1/do
1/f = 1/(3 * 12) + 1/12
f = 9 cm
the focal length is A) 9 cm
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