Two identical bulbs are wired so removing one leaves the other lit, and each bulb has the full battery potential difference. Which resistance relationship applies?

A student says, “The first bulb in a series circuit is brightest because it uses up current before the second bulb.” Which correction is right?

Use the schematic. What does ammeter A1 read?

Two point charges, +2.0 × 10⁻⁶ C and +3.0 × 10⁻⁶ C, are 0.10 m apart. With k = 8.99 × 10⁹ N·m²/C², what is the force magnitude?

The label 8.0 C on a charged sphere reports which quantity?

A single switch turns off every bulb in a loop, and there is no junction where current can split. Which rule gives the total resistance?

A student writes, “Voltage flows around the circuit and gets used by each resistor.” Which correction should replace it?

Use the schematic. What is the total current through ammeter A1?

Charges −4.0 × 10⁻⁶ C and +2.0 × 10⁻⁶ C are 0.20 m apart. What is the magnitude of their electrostatic force?

A fuse marked 15 A is rated for which circuit quantity?

At one junction, the current entering a two-branch circuit is 3.0 A. Which relationship must hold for the branch currents?

A student says, “A plastic rod becomes positive because it gains extra protons.” Which correction is right for ordinary charging?

Use the schematic. What is the equivalent resistance of the whole circuit?

A point charge +6.0 × 10⁻⁶ C creates an electric field at a point 0.30 m away. What is the field magnitude?

A 9 V battery label reports which quantity between its terminals?

Two resistors carry the same current, but their voltage drops are 2 V and 6 V. Which relationship applies to the source voltage?

A student says, “A neutral metal can’t be attracted to a charged rod because its net charge is zero.” Which correction is right?

Use the schematic. What does voltmeter V1 read?

A +2.0 × 10⁻⁶ C test charge is in a 3.0 × 10⁴ N/C electric field directed right. What force acts on it?

A resistor marked 220 Ω is labeled with which quantity?

A phone charger and a lamp each work normally when plugged into different outlets on the same circuit. Which rule explains that behavior?

A student says, “Rubber has no electric charges, so it is an insulator.” Which correction is best?

Use the schematic. What does voltmeter V1 read?

A 9.0 × 10⁰ V source is connected across a 3.0 × 10⁰ Ω resistor. What current flows?

A bulb rated 40 W is labeled with which quantity?

Adding another identical resistor as a new branch makes the total current from the battery increase. Which rule is being used?

A student says, “In a metal wire, electrons move in the same direction as conventional current.” Which correction is right?

Use the schematic. With S1 open, what is the total resistance of the conducting path?

A component has 1.2 × 10¹ V across it while 5.0 × 10⁻¹ A flows. What is its resistance?

An electric field sensor reads 250 N/C. Which quantity is it measuring?

A third resistor is added in the only path of a circuit, and the bulbs become dimmer. Which relationship explains the change?

A student says, “A 9 V battery always pushes 9 A through any circuit.” Which correction is right?

Use the field-line diagram. At point A, which way does the electric field point?

A device draws 2.5 × 10⁻¹ A from a 1.20 × 10² V source. What power does it use?

A lab note writes 1 V = 1 J/C. What does that express?

Opening one switch turns off only the lamp in that branch; the other branch stays lit. Which relationship fits the remaining circuit?

A student sketches two electric field lines crossing and says the charge there feels two field directions. What correction is right?

Use the field-line diagram. At point A, which way does the electric field point?

A 6.0 × 10¹ W lamp operates at 1.2 × 10¹ V. What is its resistance while operating?

A material table lists 1.7 × 10⁻⁸ Ω·m for copper. Which property uses the unit Ω·m?

A circuit has one branch containing two series resistors and a second branch containing one resistor. What should you do first to find the equivalent resistance?

A student says, “The bulb consumes charge, so less charge returns to the battery than leaves it.” Which correction is right?

Use the field-line diagram. At point A midway between the charges, which way does the electric field point?

A total charge of 4.8 × 10⁰ C passes a point in 2.0 × 10⁰ s. What is the current?

A student says, “Excess charge placed on a solid metal sphere spreads evenly through its whole volume.” Which correction is right?

Use the field-line diagram. At point A, which way does the electric field point?

A 6.0 Ω resistor and a 3.0 Ω resistor are connected in parallel across 1.2 × 10¹ V. What total current leaves the battery?

A student says, “In parallel, each branch gets the same current, even if the resistances differ.” Which correction is right?

Use the field-line diagram. At point A, in which direction would the force on an electron point?

Use the field-line diagram with the charge sign hidden. What is the sign of the central charge?