A 12 volt resistor is connected to a 400 ohm resistor. The circuit is temporarily disconnected and a 200 ohm resistor is added in series. Which of the following are true? Select all that apply.
The battery is producing more voltage due to more resistance in the circuit.
The current in the series circuit is 0.02 amps.
The total current in the series circuit is lower than the current in the initial circuit.
The voltage drop across the 400 ohm resistor is lower in the series circuit than it was in the simple circuit.

Which feature of a heating curve indicates a change ofn state

In a system, when potential energy decreases, then entropy also decreases. true false

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?