Recent content by matt85

A thin film of oil (n = 1.49 is spread over a puddle of water (n = 1.33). In a region where the film looks red from directly above (lambda = 629 nm), what is the minimum possible thickness of the film? ______nm Could someone please help me with this? I have no clue on this one, it was...

The distance between an object and its image is fixed at 40.0 cm. A converging lens of focal length f = 3.62 cm forms a sharp image for two positions of the lens. What is the distance a between these two positions? Determine: The distance between these two positions a = ____cm Could...

It was 4X by the way, and I got it right. Thanks for the help.

Nope, I do know that doubling the frequency of the current in the primary coil will double the emf, as will doubling the amplitude of the a.c. voltage and current in the primary coil (also will double emf).

What would be the change of the induced emf in the secondary coil of a two coil system ( without ferromagnetic core ) if both the amplitude and the frequency of the current in the primary coil would double?: emf would stay the same emf would be halved emf would be 4 times larger...

yep, it was wanting it through one turn. thanks.

A solenoid 2.9 cm in diameter and 15 cm in length has 300 turns and carries a current of 5 A. Calculate the magnetic flux through the circular cross-sectional area of the solenoid. -->> I tried using the equation B = u(0)NI/L to calculate magnetic field, and then putting this in the formula...

Force is to the east?

To the south?

Oops, I meant to say 0.35 m/s.

An electromagnetic flowmeter is used to measure blood flow rates during surgery. Blood containing Na+ ions flows due south through an artery with a diameter of 0.40 cm. The artery is in a downward magnetic field of 0.25 T and develops a Hall voltage of 0.35 mV across its diameter. (a) What is...

In the answer to a question last week from class, it was in fact negative. I know that for electrical force this would be attraction, but what would this mean for gravitational? Repulsion?

What does it mean if between an electron and a proton has negative gravitational force? Does this make the force attractive or repulsive?

That there is no force acting on it?

It is electric potential, but I don't understand why the electrical field would be zero. I was thinking maybe it could be zero or nonzero everywhere?