Questions from College Physics

Q: A 100 W incandescent lightbulb radiates visible light at a rate of

A 100 W incandescent lightbulb radiates visible light at a rate of about 10 W; the rest of the EM radiation is mostly infrared. Assume that the lightbulb radiates uniformly in all directions. Under id...

Q: The strip in the diagram is used as a Hall probe to

The strip in the diagram is used as a Hall probe to measure magnetic fields, (a) What happens if the strip is not perpendicular to the field? Does the Hall probe still read the correct field magnitud...

Q: Two metal spheres have charges of equal magnitude, 3.2

Two metal spheres have charges of equal magnitude, 3.2 × 10−14 C, but opposite sign. If the potential difference between the two spheres is 4.0 mV, what is the capacitance? [Hint: The “plates” are not...

Q: You are designing the main solenoid for an MRI machine. The

You are designing the main solenoid for an MRI machine. The solenoid should be 1.5 m long. When the current is 80 A, the magnetic field inside should be 1.5 T. How many turns should your solenoid have...

Q: Two long, straight wires, each with a current of 5

Two long, straight wires, each with a current of 5.0 A, are placed on two corners of an equilateral triangle with sides of length 3.2 cm as shown. One of the wires has a current into the page and one...

Q: A solenoid has 4850 turns per meter and radius 3.3

A solenoid has 4850 turns per meter and radius 3.3 cm. The magnetic field inside has magnitude 0.24 T. What is the current in the solenoid?

Q: The figure shows hysteresis curves for three different materials. A hysteresis

The figure shows hysteresis curves for three different materials. A hysteresis curve is a plot of the magnetic field magnitude inside the material (B) as a function of the externally applied field (B0...

Q: Given two identical, ideal batteries of emf / and

Given two identical, ideal batteries of emf / and two identical incandescent lightbulbs of resistance R (assumed constant), find the total power dissipated in the circuit in terms of / and R.

Q: Vertically polarized light with intensity I0 is normally incident on an ideal

Vertically polarized light with intensity I0 is normally incident on an ideal polarizer. As the polarizer is rotated about a horizontal axis, the intensity I of light transmitted through the polarizer...

Q: A car with a mass of 1700 kg is traveling directly northeast

A car with a mass of 1700 kg is traveling directly northeast (45° between north and east) at a speed of 14 m/s (31 mi/h), and collides with a smaller car with a mass of 1300 kg that is traveling direc...