Physics final Exam #2 Flashcards

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1
Q

Several capacitors are connected in series with a battery. The potential different across each capacitor

A

adds up to equal the emf of the battery

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2
Q

What does Kirchhoff’s junction law say?

A

current going in equals current going out

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3
Q

What can RC circuits be used for?

A

windshield wipers, computer timing, flashing lights on bikes

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4
Q

How can you model cell walls as electric elements?

A

as capacitors and resistors

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5
Q

When capacitors are connected in series

A

they have the same charge

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6
Q

Refrigerator magnets

A

have multiple poles arranged as long U-magnets

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7
Q

How are magnetic force, wire length, current, and magnetic field related?

A

F=ILB

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8
Q

The force on a moving charged object in a magnetic field is

A

perpendicular to magnetic field and the object’s velocity

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9
Q

The magnetic field inside a solenoid does not depend on

A

the radius of the solenoid

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10
Q

Two current-carrying wires parallel to each other exert

A

repulsive or attractive forces depending on the current’s direction

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11
Q

In order for an electric motor to work

A

current must change direction every half cycle

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12
Q

Which elements are ferromagnetic?

A

iron, cobalt, nickel

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13
Q

The induced current due to a changing magnetic flux produces a magnetic field which

A

opposed the change in flux

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14
Q

The potential difference created by moving a conductor in a magnetic field is called

A

motional emf

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15
Q

Induced current is current created by

A

a changing magnetic field

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16
Q

What law describes the directions of eddy currents produced when a conductor moves through a magnetic field?

A

Lenz’s law

17
Q

The polarization of electromagnetic waves refers to the orientation of

A

the electric field

18
Q

The speed of an electromagnetic wave

A

is equal to the speed of light

19
Q

Which part of the electromagnetic spectrum is more particle-like?

A

x-rays

20
Q

Which animal has 4 types of cones in their eyes?

A

chicken

21
Q

Which parts of the electromagnetic spectrum can ionize molecules and/or atoms?

A

ultraviolet, x-rays, gamma rays

22
Q

How does MRI work?

A

long solenoid, nuclei of atoms have magnetic moments and behave like magnetic dipoles

23
Q

What are materials that are strongly attracted to magnets/can be magnetized called?

A

ferromagnetic

24
Q

When is current induced in a loop of wire?

A

when flux through the loop changes