square loop of wire 0.21 m on a side lies on a horizontal table and carries a counterclockwise current of 3.8 A. The component of Earth’s magnetic field that is in the plane of the loop is 1.8×10−5T and points toward the top of the loop. a. Consider a horizontal axis of rotation that passes through the center of the loop from left to right. Does the top wire of the loop want to rotate toward you (up from the table) or away from you (down into the table)? b. Calculate the magnitude of the torque about the axis described in part A. Express your answer to two significant figures and include appropriate units.

Mono-ionized atoms (an electron withdrawn) are accelerated and then passed through a speed selector made up of perpendicular electric and magnetic fields. The electric field is 155 V / m and the magnetic field is 0.0315 T. The ions then enter a uniform magnetic field of modulus 0.0175 T which is oriented perpendicular to their speed.at. How fast do the ions move as they emerge from the speed selector?b. If the radius of the path of the ions in the second magnetic field is 17.5 cm, what is their mass?

A 0.55-meter-long wire carries a current with electron flow directed to the East. It is present in a magnetic field of intensity of 0.050 T and directed to the South. The force acting on the wire is 0.220 N. a. What is the magnitude of the current in the wire? b. In what direction is the force acting on the wire?

Q8.2

The uniform 30.0 mT magnetic field in the figure points in the positive z-direction. An electron enters the region of magnetic field with a speed of 5.50 x 106 m/s and at an angle of 30° above the xy-plane. (Figure 1) Figure X Z 000 30° 12 1 of 1 Part A Find the radius r of the electron's spiral trajectory. Express your answer with the appropriate units. I JA Value Submit Part B DO Request Answer Find the pitch p of the electron's spiral trajectory. Express your answer with the appropriate units. μÅ Value Units Submit Request Answer Return to Assignment Units www ? Provide Feedback ?

The uniform 33.0 mT magnetic field in the figure points in the positive z-direction. An electron enters the region of magnetic field with a speed of 5.00 ×106 m/s and at an angle of 30° above the xy-plane. (Figure 1) Figure X B 000 30° y 1 of 1 ▼ Part A Find the radius r of the electron's spiral trajectory. Express your answer with the appropriate units. Value Submit Part B μA Submit Value Provide Feedback Request Answer Find the pitch p of the electron's spiral trajectory. Express your answer with the appropriate units. HÅ Units Units Request Answer WWW ? ?

A small circular coil of 20 loops of wire having a radius of 1 cm is at rest in the X-y plane (so the normal to the loop points in the +z-direction). A uniform magnetic field of 0.5 T is turned on in the +x-direction. What is the magnetic flux through the loop? a. 7.85 x 10 Tm² b. 1.57 x 10 4 T m² O c. 3.14 x 10 3 T m2 O d. 0 T m2

N circular loops of conducting wire of radius 3.0 cm carries a current of 10 A. If the magnetic field at the center of the multiple turns of loop is 3.14 x 10-3 T, how many turns of loop are in the conducting coil?   a. 15   b. 10   c. 30   d. 20   e. 25

Joe has rolled a long electrical extension cord into a coil of radius rc=19 cm with Nc=14 loops. The coil of extension cord is initially lying horizontally (flat) on the floor of Joe's garage. Joe picks up the coil and rotates it 90° counterclockwise in tr=0.85 seconds so that the coil is now vertically oriented (see the figure). a. If the Earth's magnetic field has strength 0.50 gauss and makes an angle of 20.0 degrees with the garage floor, calculate the change in the magnetic flux ΔΦB, in webers, through one of the loops of the coil during the rotation. Treat the initial flux as having a positive sign.  b. Calculate the average induced emf εc, in volts, in the coil during the rotation.  c. If the extension cord had a resistance of 3.0 ohms and formed a closed circuit without any other components, calculate the induced current Ic, in amps, in the extension cord.

b