A solenoid is made from a 25-m length of wire of resistivity2.3 * 10-8 Ω # m. The wire, whose radius is 2.1 mm, is wrappeduniformly onto a plastic tube 4.5 cm in diameter and 1.65 m long.Find the emf to which the ends of the wire must be connected toproduce a magnetic field of 0.015 T within the solenoid.

The 12.0 cm long rod as shown moves at 4.00 m/s.What is the strength of the magnetic field if a 95.0 V emf isinduced?

1. A 11.8 ?F capacitor is charged by a 25.0 V battery through a resistance R. The capacitor reaches a potential difference of 4.00 V at a time 3.00 s after charging begins. Find R. ________ kΩ 2.A proton moves perpendicular to a uniform magnetic field  at a speed of 1.20  107 m/s and experiences an acceleration of 1.40  1013 m/s2 in the positive x-direction when its velocity is in the positive z-direction. Determine the magnitude and direction of the field. magnitude _______    PLEASE ANSWER BOTH

Two long straight wires enter a room through a door. One carries a current of 3.0 A into the room while the other carries a current of 5.0 A out. What is the magnitude of the path integral $B ds around the door frame? O 6.3 x 10-6 T-m O 2.5 x 10-6 T-m O 3.8 x 10-6 T-m O None of these O 1.0 x 10-6 T-m

An intrepid physics student transports a loop of wire from their hometown all the way to Earth's north magnetic pole. The loop has a radius ofr = 50 cm and a total resistance 75 m2, and the plane of the loop is held parallel to the ground at all times. In their hometown, Earth's magnetic 35 µT and points slightly into the ground, making an angle of 0 = 15° with a line that points due north. At the north magnetic pole, Earth's magnetic field 60 µT and points directly into the ground. If the student completed this journey over the course 48 hours, then what was the average current induced in the loop? Provide both the magnitude and direction of the current (as viewed from above the loop), and include a sketch of the "initial" and "final" configurations as part of of R field has a magnitude of B; has a magnitude of Bf of t your representation.

There are two concentric tungsten wire loops; a 4 cm radius loop and a 33 cm radius loop. The cross-sectional area of each wire is 0.009 m2. The current in the larger loop goes from 0 A to a counterclockwise 9 A in 5.9  10-4 s. Find the voltage & current in the smaller loop during the stated time interval. Assume the B-field of the larger loop is uniform (though not constant) across the smaller loop. V = I =

A square wire with 2 m sides is perpendicular to a uniform magnetic field, with half the area of the loop in the field as shown in the figure. The loop contains a 20 V battery with negligible resistance. If the magnitude of the field varies with time according to B = 1.1410 - 0.8500 t with B in teslas and t in seconds, what is the total emf in the circuit?

7 A Z S 30 H command 9. An electric power station that operates at 35 kV and uses a 10:1 step-up ideal transformer is producing 34 MW (Mega- Watt) of power that is to be sent to a big city which is located 300 km away with only 2.5% loss. Each of the two wires are made of copper (resistivity = 1.72 x 10-22.m). What is the diameter of the wires? X 0.85 cm x E 30 R 5 T 6 DEL LL B MacBook Air H N 8 J D 1 M ( 9 K MOSISO A P - command ? option

It is desired to construct a solenoid that will have a resistance of 4.65 N (at 20°C) and produce a magnetic field of 4.00 x 10-2T at its center when it carries a current of 3.85 A. The solenoid is to be constructed from copper wire having a diameter of 0.500 mm. If the radius of the solenoid is to be 1.00 cm, determine the following. (The resistivity of copper at 20°C is 1.7 x 10-8 n. m.) (a) the number of turns of wire needed to build the solenoid 853.2 v turns (b) the length the solenoid should have 426 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. cm

A rectangular slab (length 2.5 cm, width 1.5 cm, thickness 5.0 mm) of an unknown semiconductor with an unknown dopant was analyzed by placing it under a perpendicular magnetic field of strength 0.10 T in the +y direction, as well as subjecting it to a current of 7.5 A in the +x direction.    A voltmeter measured that the potential on the top of the slab (as seen from the front) is 93.75 mV higher than the bottom.  What is the majority charge carrier?Justify why.