The rod shown in the accompanying figure is moving through a uniform magnetic field of strength B = 0.85 T with a constant velocity of magnitude v = 4.5 m/s. What is the potential difference between the ends of the rod? Which end of the rod is at a higher potential? B 5.0 cm Hint a. The magnitude of the potential difference between the ends of the rod is V. b. The Select an answer v of the rod is at a higher potential.

PP5

Two coils have the same number of circular turns and carry the same current. Each rotates in a magnetic field acting perpendicularly to its axis of rotation. Coil 1 has a radius of 4.6 cm and rotates in a 0.21-T field. Coil 2 rotates in a 0.54-T field. Each coil experiences the same maximum torque. What is the radius (in cm) of coil 2? Number i Units

A charge q = 6.0 × 106 C is distributed uniformly around a thin ring of radius r = 10 cm. The ring is rotating about an axis through its center and perpendicular to its plane, at an angular speed w = 300 rad/s. What is the magnitude of the magnetic moment of the rotating charge? Number Units

The magnetic field in the figure is decreasing at the rate 0.2 T/s. (Eigure 1) You may want to review (Pages 852-855). Figure 2.0 cm b I cm I cm I cm < 1 of 1 ▼ Part A What is the magnitude of the acceleration of a proton at rest at point a? Express your answer to two significant figures and include the appropriate units. a= Submit Part B LO Value Submit HA horizontally to the left upward horizontally to the right downward a=0 Request Answer What is the direction of the acceleration of a proton at rest at point a? Part C Previous Answers ✓ Correct Here we learn how to determine the direction of the acceleration of a proton at rest in a solenoid with a changing magnetic field. Units HA What is the magnitude of the acceleration of a proton at rest at point b? Express your answer as an integer and include the appropriate units. a= Value ? Submit Request Answer Units ?

An infinitely long wire carries a current of I = 155 A. a) Consider a circle with a radius r and centered on the wire. Determine the magnitude of the magnetic field B at points along the circle in terms of I and r. b) If r=0.11 m, calculate the numerical value of B in tesla

Four long, parallel conductors carry equal currents of I = 5.00 A. Figure P19.49 is an end view of the conductors. The direction of the current is into the page at points A and B (indicated by the crosses) and out of the page at C and D (indicated by the dots). Calculate the magnitude and direction of the magnetic field at point P , located at the center of the square with edge of length 0.200 m.

A current of 20.0 mA is maintained in a single circular loop of 2.20 m circumference. A magnetic field of 0.410 T is directed parallel to the plane of the loop. (a) Calculate the magnetic moment of the loop. If you know the circumference of a circle, how do you find the area? mA. m² (b) What is the magnitude of the torque exerted by the magnetic field on the loop? A magnetic dipole will tend to orient so that the plane of the loop is perpendicular to the magnetic field. mn. m

I 5 cm A rectangular loop (10 cm length and 5 cm width) placed 5 cm from a long straight wire in the x-y plane. both loop and wire carry 10 cm I the same current I = 3 A. the current directions are shown in the figure. a) Calculate the magnitude and direction of 5 cm the net force on the loop. b) What is the magnitude of the net torque on the loop and why?

Currents in the Heart. The body contains many small currents caused by the motion of ions in the organs and cells. Measurements of the magnetic field around the chest due to currents in the heart give values of about 10 uG. Although the actual currents are rather complicated, we can gain a rough understanding of their magnitude if we model them as a long, straight wire. If the surface of the chest is 5.0 cm from this current, how large is the current in the heart?