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Physics 251 > Exam 2 Concepts > Flashcards

Exam 2 Concepts Flashcards

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1
Q

Four unequal resistors are connected in series with each other what statement could you make about the combination?

A

The equivalent resistance is more than the largest resistance

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2
Q

when unequal resistors are connected in parallel in a circuit the voltage…

A

…the potential drop (voltage) is always the same across each resistor.

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3
Q

As more resistors are added in series to a constant voltage source, the power supplied by the voltage….

A

…decreases

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4
Q

Kirchhoff’s loop rule is a statement of…

A

…conservation of energy

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5
Q

4 unequal resistors are connected in a parallel with each other, what statement can you make about it

A

The equivalent resistance is less than that of the smallest resistor

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6
Q

When unequal resistors are connected in series across constant voltage, the power supplied by the source…

A

increases

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7
Q

Kirchoff’s junction rule is a statement of…

A

…conservation of charge

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8
Q

A capacitor is connected in series with a resistor and an open switch. If a second capacitor is connected in series with the first one the time constant of the new RC will be

A

smaller than before

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9
Q

charged capacitor connected in series with resistor and open switch, when switch closes what will the graph of Q look like

A

Gradually decreasing

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10
Q

a straight bar magnet is initially 4cm long with north on right and south on left, if you cut the magnet in half…

A

each will contain a north pole on the right and a south pole on the left

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11
Q

Quantity with units Ns/Cm is a…

A

Magnetic field

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12
Q

charged particle injected into a uniform magnetic field where velocity is perpendicular to mag field. the particle will move…

A

…follow a circular path

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13
Q

The direction of the force on a current carrying wire in a mag field is…

A

…perpendicular to both current and mag field

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14
Q

two parallel wires are placed side by side on a horizontal table. if wires carry current in the same direction what happens to the wire?

A

the wires are pulled towards each other

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15
Q

two parallel wires side-by-side on a horizontal table carry the same current in opposite directions. Wire on right has current towards you and wire on left has current away from you. The mag field in the middle of the wires is…

A

…pointing downward

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16
Q

a charged particle that is moving in a static uniform magnetic field…

A

may experience a magnetic force, but its speed will not change

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17
Q

an electron moving south enters a magnetic field and the electron curves upward. The mag field must have a component…

A

…towards the west

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18
Q

we observe that a moving charged particle experiences no magnetic force, from this we can conclude that…

A

no mag field exists or particle is moving parallel to the field

19
Q

the direction of force on a current carrying wire in a magnetic field is…

A

…perpendicular to current and mag field

20
Q

long straight wire right hand rule

A

-thumb in current direction
-fingers wrap mag field

21
Q

loop right hand rule

A

-thumb in mag field
-fingers wrap current`

22
Q

forces right hand rule

A

-finger velocity
-palm mag field
-thumb force

23
Q

charging RC circuit

A

V(1-e)

24
Q

discharging RC circuit

A

(V) e

25
Q

things in parallel for R and C have…

A

same voltage

26
Q

Things in series for R have…

A

same current

27
Q

Things in series for C have…

A

same charge

28
Q

going from - to + across a battery you…

A

add voltage

29
Q

going from + to - across a battery you…

A

subtract voltage

30
Q

Going in direction of current across R you…

A

subtract R (voltage)

31
Q

going against current across R you…

A

add R (voltage)

32
Q

if flux (or current) is increasing then…

A

induced field is opposite direction

33
Q

if flux (or current) is decreasing then…

A

induced field is same direction

34
Q

magnets flow from…

A

North to South

35
Q

If straight wires are moving in opposite directions they…

A

repel each other

36
Q

when crossing a resistor in the long double loop problems you…

A

add/subtract the quantity of resistance multiplied by current

37
Q

a flat coil in a uniform magnetic field has the greatest mag flux through the coil when…

A

…it isperpendicular to mag field

38
Q

T/F, coil in strong mag field must have greater induced emf in it than a coil in a weak mag field

A

False

39
Q

T/F, according to Lenz’s law the induced current in a circuit always flows to oppose the external mag flux through the circuit

A

False

40
Q

an outer ring surrounds an inner ring. The current in outer ring is counterclockwise and decreasing, what is the direction of induced current in inner ring?

A

counterclockwise

41
Q

a bar magnet is oriented above a copper ring, if pulled up what is the direction of the current induced in the ring?

A

counterclockwise

42
Q

bar magnet moves away from a solenoid, direction of induced current is…

A

…from a to b

43
Q

metal bar in contact with parallel rails with upward velocity and downward magnetic field, what happens to the current…

A

…no current is induced

44
Q

fk =

A

uk * Fn

Physics 251 (4 decks)

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