Recent content by JosephK

We used a wheatstone bridge, which is an electric circuit consisting of four resistors.Two of the resistors are known, one resistor is a large "resistor" with dials that control the resistance, and the fourth resistor can either be a metal or semiconductor. The metal was heated to about 290 °C...

Homework Statement Parallel rays of green mercury light with a wavelength of 546 nm pass through a slit covering a lens with a focal length of 60.0 cm. In the focal plane of the lens the distance from the central maximum to the first minimum is 10.2 mm. What is the width of the slit...

Hi, Looking at the emission spectra of Mercury, for instance, how do the lines (I count 9 in the visible range: dark red, lighter red, orange, 3 yellows, green, purple, dark purple) superimpose to give light blue glow? My lab partner said that blue is the average of the wavelengths, such...

Thank you

Homework Statement We want to construct a solenoid with a resistance of 4.30 Ω and generate a magnetic field of 3.70 × 10−2 T at its center when applying 4.60 A of electrical current. We want to use copper wire with a diameter of 0.500 mm. If we need the solenoid's radius to be 1.00 cm...

Potential across charged capacitor is Q/C. The current through charged capacitor is zero. Applying Kirchhoff's loop rule ε - q/C - IR = 0 ε - q/C - (dq/dt) R = 0 ( dq / dt ) R = ε - q/C ( dq / dt ) R = (εC - q) / C dq / (-εC + q) = -dt / ( RC ) \int_0^q dq / (-εC + q) =...

I understand this problem now. Since the magnetic field is directed in the x direction, the magnetic force is not directed in the x direction. Thus, acceleration in the x direction is zero. And so, velocity in the x direction is constant. We obtain velocity in the x direction by multiplying...

Hello, I am taking introductory Physics and need practice and help with circuits. Can I post my attempt at the solution? Thank you

Homework Statement A uniform magnetic field of magnitude 0.137 T is directed along the positive x axis. A positron moving at a speed of 5.40 106 m/s enters the field along a direction that makes an angle of θ = 85.0° with the x-axis (see figure below). The motion of the particle is expected...

Homework Statement A charge Q is placed on a capacitor of capacitance C. The capacitor is connected into the circuit as shown in the figure below, with an open switch, a resistor, and an initially uncharged capacitor of capacitance 3C. The switch is then closed and the circuit comes to an...

ρ=AΔVL / I where L = r should be ρ=AΔV/rI then from part a, replacing A and r, ρ=(2pi L)ΔV/(ln(r_b / r_a) I

(b) \rho = \frac{1}{\sigma} \rho = \frac{E}{J} \rho = \frac{AE}{I} where A = 2 \pi rdr \rho = \frac{A \Delta V L}{I} where L = r Does \rho depend on geometry? Why do I need to integrate?

I wrote formula for dR without recognizing dr.

I have trouble with integrals.

Homework Statement An oceanographer is studying how the ion concentration in seawater depends on depth. She makes a measurement by lowering into the water a pair of concentric metallic cylinders at the end of a cable and taking data to determine the resistance between these electrodes as a...