A 8.00-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.340 S2. Pulling the wire at a steady speed of v=4.00 m/s causes 4.30 W of power to be dissipated in the circuit. Y Part A How big is the pulling force? Express your answer with the appropriate units. ▸ View Available Hint(s) F= Value Submit Part B HÅ What is the strength of the magnetic field? Express your answer with the appropriate units. ▸ View Available Hint(s) B= Value Submit Provide Feedback HÅ Units Units ?

A current loop in a motor has an area of 1.95 cm² . It carries a 240 mA current in a uniform field of 0.62 T. 1 Part A What is the magnitude of the maximum torque on the current loop? Express your answer with the appropriate units. T= BHA μÅ S Value → C Units ?

A compass needle points 19° E of N outdoors. However, when it is placed 12.0 cm to the east of a vertical wire inside a building, it points 35 ° E of N. The Earth's field is the same at both positions of the compass, it is 0.50×10-4 T and is horizontal. What is the magnitude of the current in the wire? Express your answer using two significant figures and include the appropriate units. I = Submit Part B Value east west up μÀ What is the direction of the current in the wire? down Request Answer Units ?

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

A straight wire with a length of 60.0 cm is bent into a perfect circle and placed in a perpendicular magnetic field as illustrated below. The magnetic field is changing at a rate of 12 T/s. Hint: for a circle... c = 2nr A = ar² N Part A If resistance of the wire loop is 3.2 N, the electric current in the wire will I= А

The magnetic field B at all points within the colored circle of the figure (Figure 1)has an initial magnitude of 0.700 T. (The circle could represent approximately the space inside a long, thin solenoid.) The magnetic field is directed into the plane of the diagram and is decreasing at the rate of 0.0300 T/s. Figure X X X X X B X /b X 1 of 1 10.0 cm Part C What is the current in the ring if its resistance is 4.00 $? ΑΣΦ I = Submit Part D X Incorrect; Try Again; 5 attempts remaining What is the emf between points a and b on the ring? ε = Previous Answers Request Answer Submit Part E ΠΙΑΣΦ Request Answer ? IVE ΑΣΦ ? A If the ring is cut at some point and the ends are separated slightly, what will be the emf between the ends? ? V

A the moving rod has a resistance of 0.25 Ω and moves on rails 20.0 cm apart. The stationary U-shaped conductor has negligible resistance. When a force of 0.410 N is applied to the rod, it moves to the right at a constant speed of 1.50 m/s. What is the magnetic field?

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A coil has 200 turns enclosing an area of 10.8 cm² . In a physics laboratory experiment, the coil is rotated during the time interval 0.036 s from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.00×10-5 T. Part A What is the magnitude of the magnetic flux through one turn of the coil before it is rotated? Express your answer in webers. ► View Available Hint(s) | Þinitial Submit —| ΑΣΦ Part B xa Xb 7 √x V x 2.0.10 5 Previous Answers X <४ |X| ? X.10n X www Wb X Incorrect; Try Again; 2 attempts remaining The angle between the magnetic field and the area vector of the coil is either 0 or 180 degrees. Note that you can choose to view the coil from either side, as long as you stick to using the same side for the entire calculation/experiment. This gives a factor of ±1 in the formula for flux. What is the magnitude of the…

A shunt-wound DC motor with the field coils and rotor connected in parallel (Figure 1) operates from a 130 V DC power line. The resistance of the field windings, R, is 208 n. The resistance of the rotor, R. is 4.90 n. When the motor is running, the rotor develops an emf E. The motor draws a current of 4.46 A from the line. Friction losses amount to 45.0 W Part A Compute the field current Ir. Express your answer in amperes. • View Available Hint(s) Temglates Symbols undo regdo Tesel keyboard shortcuts Help A I = 0.56 Submit Prevlous Anewere X Incorrect, Try Again; 4 attempts remaining Part B Compute the rotor current I > View Available Hint(s) Figure 1 of 1 Templates Symbols undo redo Teset keyboard shortcuts Help A. I = 4,26 Submit Prevlous Answers X Incorrect; Try Again; 5 attempts remaining R ER. Part C Compute the emf E.