课程名称︰普通物理学甲下 课程性质︰大一必修 课程教师︰李庆德 开课学院：电资学院 开课系所︰电机工程学系 考试日期（年月日）︰2015/06/16 考试时限（分钟）：50 分钟 试题 : =============================================================================== General Physics A(2015 spring) Quiz 3 1. Faraday's law states that an induced emf is proportional to: (A) the rate of change of the magnetic field (B) the rate of change of the electric field (C) the rate of change of the magnetic flux (D) the rate of change of the electric flux (E) zero 2. A rod lies across frictionless rails in an uniform magnetic field B, as shown. The rod moves to the right with speed v. In order for the emf around the circuit to be zero, the magnitude of the magnetic field should: Fig: (A) not change (B) increase linearly with time (C) decrease linearly with time (D) increase quadractically with time (E) decrease quadractically with time 3. A changing magnetic field pierces the interior of a circuit containing three identical resistors. Two voltmeters are connected as shown, V1 reads 1 mV across R. V2 reads the voltage across the other two resistors, which is: Fig: (A) 0 V (B) 1/3 mV (C) 1/2 mV (D) 1 mV (E) 2 mV 4. The diagram shows a circular loop of wire that rotates at a steady rate about a diameter O that is perpendicular to a uniform magnetic field. The maximum induced emf occurs when the point X on the loop passes: Fig: (A) a (B) b (C) c (D) d (E) e 5. A long straight wire is in the plane of a rectangular conducting loop. The straight wire carries a constant i, as shown. While the wire is being moved toward the loop, the current in the loop is: Fig: (A) zero (B) clockwise (C) counterclockwise (D) clockwise in the left side and counterclockwise in the right side (E) counterclockwise in the left side and clockwise in the right side 6. Consider the mechinical system consisting of two strings and a block, as shown. Which one of the five eletrical circuit(I, II, III, IV, V) in the analog of the mechanical system? Fig: (A) I (B) II (C) III (D) IV (E) V 7. An LC series circuit with an inductance L and capacitance C has an oscillation frequency f. If we now take two of those inductors, each with inductance L, and two of the capacitors, each with capacitance C, and wire them all in series to make a new circuit, its oscillation frequency will be: (A) f/4 (B) f/2 (C) f (D) 2f (E) 4f 8. An RLC circuit has a resistance of 200 Ω and an inductance of 15 mH. Its oscillation frequency is 7000 Hz. At time t = 0 the current is 25 mA and there is no charge on the capacitor. After five complete cycles the current is: (A) 0 A (B) 1.8 x 10^(-6) A (C) 2.1 x 10^(-4) A (D) 2.3 x 10^(-3) A (E) 2.5 x 10^(-2) A 9. An RLC series circuit has R = 4Ω, Xc = 3Ω, and XL = 6Ω. The impedance of this circuit is: (A) 5 Ω (B) 7 Ω (C) 7.8 Ω (D) 9.8 Ω (E) 13 Ω 10. In a sinusoidally driven series RLC circuit the current lags the applied emf. The rate at which energy is dissipated in the resistor can be increased by: (A) decreasing the capacitance and making no other changes (B) increasing the capacitance and making no other changes (C) increasing the inductance and making no other changes (D) increasing the driving frequency and making no other changes (E) decreasing the amplitude of the driving emf and making no other changes =================================== 试题完 ================================== 备注： 图片待补。 --

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