Electrical Circuit Symbols and Concepts

Which of the following is FALSE?

• A) Electric charge is not created, it can only be exchanged or transferred.

• B) Electric charge is a continuous quantity that can be subdivided indefinitely.

• C) There are two types of charges exist: positive and negative.

• D) None of the above

Under what condition does an attractive force occur between two charged objects?

• A) the charges are of like signs

• B) the charges are of unlike signs

• C) the charges are of equal magnitude

• D) the charges are of unequal magnitude

A metallic object holds a charge of –3.8×10–6 C. What total number of electrons does this represent?

• A) 4.2×10^14

• B) 6.1×10^13

• C) 2.4×10^13

• D) 1.6×10^14

Which of the following is FALSE?

• A) A stationary electric charge is surrounded by an electric field.

• B) A stationary electric charge is surrounded by a magnetic field.

• C) A moving electric charge is surrounded by an electric field.

• D) A moving electric charge is surrounded by a magnetic field.

A metallic conductor has a resistivity of 18.0×10–6 Ω·m. What is the resistance of the conductor if it is 30.0 m long and has a uniform cross-sectional area of 3.00×10–6 m²?

• A) 0.0560 Ω

• B) 1.80×10^2 Ω

• C) 1.60×10^2 Ω

• D) 90.0 Ω

What is the resistance of a resistor having 4 bands: Green, Blue, Red, Silver?

• A) 560 Ω with a 10% tolerance

• B) 5.6 kΩ with a 5% tolerance

• C) 5.6 kΩ with a 10% tolerance

• D) 56 kΩ with a 5% tolerance

A parallel-plate capacitor has a capacitance of 20.0 μF. What potential difference across the plates is required to store 7.20×10–4 C on this capacitor?

• A) 36.0 V

• B) 2.20×10–2 V

• C) 1.40×10–8 V

• D) 68 V

Inserting a dielectric material between two charged parallel conducting plates, originally separated by air and disconnected from a battery, will produce what effect on the capacitor?

• A) increase charge

• B) increase voltage

• C) increase capacitance

• D) decrease capacitance

A 10.0-μF capacitor is attached to a 20.0-V power supply. How much energy is stored in the capacitor?

• A) 2.00×10–3 J

• B) 1.20×10–3 J

• C) 2.00×10–4 J

• D) 5.20×10–4 J

A coil with an inductance of 0.750 mH (0.750×10–3 H) experiences a constant current buildup from zero to 15.0 A in 0.250 s. What is the magnitude of the induced emf during this interval?

• A) 0.0190 V

• B) 0.0300 V

• C) 0.0450 V

• D) 0.470 V