You have a circular loop of wire in the plane of the page with an initial radius of 0.50  m  which expands to a radius of 1.00  m . It sits in a constant magnetic field  B  = 38  mT  pointing into the page. Assume the transformation occurs over 1.0 second and no part of the wire exits the field. Also assume an internal resistance of 30  Ω . What average current is produced within the loop and in which direction?

Suppose you wish to measure the current in a wire. You have a device that can measure the strength of the magnetic field produced by the wire, but the device does not directly measure the current. If the device is place 1.32m away from the wire, and the magnetic field strength is 0.93μT, what is the current running through the wire in Amps? Note: It is understood that the unit of your answer is in A, however do not explicitly include units in your answer. Enter only a number. If you do enter a unit, your answer will be counted wrong.

A stationary square coil of area 0.1 m2 is brought over time of 2 s into the magnetic field 8.9 T with its plane perpendicular to the magnetic field. The coil has 1030 turns. Calculate the magnetic flux linkage through the coil. Give your answer in SI units.

A piece of copper wire has a resistance per unit length of 5.12 × 10-3/m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.149 m. The ends of the wire are connected to a 12.0-V battery. Find the magnetic field strength at the center of the coil.

A piece of copper wire has a resistance per unit length of 5.40 × 10³/m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.118 m. The ends of the wire are connected to a 12.0-V battery. Find the magnetic field strength at the center of the coil. Number Units

Assume the region to the right of a certain plane contains a uniform magnetic field of magnitude b= 1.11 mT and the field is zero in the region to the left of the plane as shown in the figure below. An electron, originally traveling perpendicular to the boundary plane, passes into the region of the field. xxxxx B=0 xxxxx xxxxx xxxxx xxxxx B=b (a) Determine the time interval required for the electro t leave the "field-filled" region, noting that the electron's path is a semicircle. (b) Assuming the maximum depth of penetration into the field is 3.18 cm, find the kinetic energy of the electron. ev

In an experiment designed to measure the Earth's magnetic field using the Hall effect, a copper bar 0.440 cm thick is positioned along an east-west direction. Assume n = 8.46 x 1028 electrons/m³ and the plane of the bar is rotated to be perpendicular to the direction of B. If a current of 8.00 A in the conductor results in a Hall voltage of 5.80 x 1012 v, what is the magnitude of the Earth's magnetic field at this location? 0.0431 Your response is off by a multiple of ten. µT

The loop in the figure is being pushed into the 0.20 T magnetic field at 45 m/s . The resistance of the loop is 0.50 N. (Figure 1) You may want to review (Pages 849 - 851) . Figure 1 of 1 V В 5.0 cm

A loop of wire moves with a velocity of 3.0 m/sm/s through a magnetic field whose strength decreases with distance at a rate of 5.0 μT/m�T/m. If the loop has an area of 0.75 m2m2 and internal resistance of 0.50 ΩΩ, what is the current in the wire?

At a certain place, Earth's magnetic field has magnitude B =0.806 gauss and is inclined downward at an angle of 71.1° to the horizontal. A flat horizontal circular coil of wire with a radius of 13.1 cm has 939 turns and a total resistance of 73.9 Q. It is connected to a meter with 130 Q resistance. The coil is flipped through a half-revolution about a diameter, so that it is again horizontal. How much charge flows in coulombs through the meter during the flip? Number Units