A conducting bar of length L = 0.40 m rotates in a counterclockwise direction with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 7.5 T) is directed out of the paper. What is the potential difference, Vp- VA?

A rectangular loop has an area 0.75 m2, and has 100 turns of wire, that sits in the horizontal plane. A uniform magnetic field of strength 7 T, vertical, passes through the loop. The loop is turned 90◦ around one its horizontal axes, in 3× 10−2 s. What electromotive force develops in the loop?

A student makes a short electromagnet by winding 390 turns of wire around a wooden cylinder of diameter d = 4.9 cm. The coil is connected to a battery producing a current of 4.6 A in the wire. (a) What is the magnitude of the magnetic dipole moment of this device? (b) At what axial distance z >>d will the magnetic field have the magnitude 4.2 μT (approximately one-tenth that of Earth's magnetic field)?

A particle having mass m = 2.80E-4 kg carries a negative charge q= −1.70E-6 C . The particle is given an initial velocity in the −y direction (downward), as shown in the figure, of v = 2.41E2 m/s. Everywhere in space there is a uniform constant magnetic field B = 0.340 T pointing in the +z direction, which is out of the plane of the page. What is the the magnetic force that B exerts on the particle (in N; use positive sign if the force points in the +x direction and negative sign if the force points in the −x direction)?

The right half of the square loop of wire shown is in a 0.85 T magnetic field directed into the page. The current in the loop is 1.3 A in a clockwise direction. What is the magnitude of the force on the loop, and in which direction does it act?

Consider a thin long conducting wire and a coaxial long conducting cylindrical shell with inner radius a=0.02 mm and outer radius b=0.04 mm. Currents flow in opposite directions with the same magnitude /=2,6 A. The cylindrical shell has a uniform current density. The cross-section view is shown in the figure below. Take po = 4 x 10 7Tm/A, π = 3. b) Find the magnitude of the magnetic field at a perpendicular distance r=0.03 mm from the thin inner wire, in militesla (mT). -I O +I b a Search 1 Uyc

An electron moves in a circular path with a speed of 1.21 x 10' m/s in the presence of a uniform magnetic field with a magnitude of 1.92 mT. The electron's path is perpendicular to the field. (a) What is the radius (in cm) of the circular path? cm (b) How long (in s) does it take the electron to complete one revolution?

The figure below shows a cube with side length d = 13.8 cm with one of its corners at the origin. The cube is subject to a uniform magnetic field B = (2î - 6ĵ – 5k) T. y (a) What is the magnetic flux through the top face of the cube? Wb (b) What is the total magnetic flux through all six faces of the cube? Wb

A strip of copper 150 mm thick and 4.5 mm wide is placed in a uniform magnetic field of magnitude 0.65 T, with perpendicular to the strip. A current i = 23 A is then sent through the strip such that a Hall potential difference V appears across the width of the strip. Calculate V. (The number of charge carriers per unit volume for copper is 8.47* 10^28 electrons/m3.)

An eight-turn coil encloses an elliptical area having a major axis of 40.0 cm and a minor axis of 30.0 cm (see figure). The coil lies in the plane of the page and carries a clockwise current of 5.55 A. If the coil is in a uniform magnetic field of 2.09 x 10-4 T directed toward the left of the page, what is the magnitude of the torque on the coil? Hint: The area of an ellipse is A = лab, where a and b are, respectively, the semimajor and semiminor axes of the ellipse. N•m 18 I 30.0 cm T 40.0 cm