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Flashcards in Exam 3 Deck (32)
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1

What is the EMF of a battery?

The maximum potential difference between the terminals of the battery.

2

What happens as a dry cell ages?

It's resistance goes up

3

In a series circuit what happens with current and voltage through all the elements?

-Current is the same across all the elements.
-Voltage is divided across each of the elements.

4

In a parallel circuit what happens with current and voltage through all the elements?

-Current gets divided across each element
-Voltage is the same across all elements

5

Series circuit is a _____ divider and a parallel circuit is a _____ divider.

Series is a voltage divider
Parallel is a current divider

6

Kirchhoff's voltage rule is an example of conservation of energy. True or False?

True

7

Does a capacitor charge linearly?

No it does not. It's a non-linear equation.

8

In an RC circuit as the switch is closed what happens to the charge and voltage across the resistor?

Both start increasing with time.

9

What is terminal voltage?

The potential difference between the terminals of a battery

10

In a series circuit is the current the same throughout each resistor?

Yes the current is the same in a series circuit.

11

Kirchhoff's junction rule is a statement of

the law of conservation of charge

12

Kirchhoff's loop rule is a statement of

the law of conservation of charge

13

the capacitor _____ the current through while charging and discharging but ____ when fully charged.

Allows current during charging/discharging
Does not allow current when fully charged

14

Voltmeters should have an internal resistance of

Infinite

15

Ammeters should have an internal resistance of

0

16

What field is continuous, magnetic or electric?

Magnetic field is continuous

17

Using the right hand rule:
Current in +Y direction, what is the direction of the magnetic field?

Counterclockwise around y axis.

Thumb points in direction of current, fingers point in direction of magnetic field.

18

The force on a current-carrying wire in a magnetic field is equal to zero when _____

the current is parallel to the field lines
F = ILBsin0

19

The force on a current-carrying wire in a magnetic field is the strongest when

the current is perpendicular to the field lines.

20

The sign of the charge carriers in a current can be determined using the

Hall effect

21

A charged particle traveling opposite to a magnetic field does not experience a magnetic force. T/F

True

22

Can magnetic field lines cross?

Never

23

The field outside a solenoid behaves like

the field of a bar magnet

24

Currents in the same direction in parallel wires produce

an attractive force

25

Currents in the opposite direction in parallel wires produce

a repulsive force

26

Using ampere's law, the integral must be evaluated _____

around a closed path

27

Ampere is defined as

using the force between current carrying wires

28

Magnetic field between two parallel wires with current in same direction have a magnetic field at the midpoint of?

Zero
Keyword parallel and current in same direction

29

The magnetic permeability of a ferromagnetic material is

Much greater than Uo

30

Ferromagnetic materials lose their ability to form permanent magnets if

heated above their Curie temperature.