Anupright rectangular loop of height a and width b has a lightbulb attached to it, with some resistance R. It is immersed in a constant magnetic field with magnitude B0, pointing into the page. Now you want to turn on the lightbulb by using Faraday’s law of electromagnetic induction. Solve for the power delivered in the lightbulb.
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- Consider the arrangement shown in Figure P20.30. Assume R = 6.00 V, ℓ = 1.20 m, and a uniform 2.50-T magnetic field is directed into the page. At what speed should the bar be moved to produce a current of 0.500 A in the resistor?bar of length 0.15 m slides along metal rails at a speed of 5 m/s. The bar and rails are in a magnetic field of 40 T, pointing out into the page. The resistance of two resistors in parallel is both 20 Ω, and the resistance of the bar is 5 Ω. What is the current in the bar? a) 1 A b) 2 A c) 3 A d) 5 AA 144-Ω light bulb is connected to a conducting wire that is wrapped into the shape of a square with side length of 83.0 cm. This square loop is rotated within a uniform magnetic field of 454 mT. What is the change in magnetic flux through the loop when it rotates from a position where its area vector makes an angle of 30° with the field to a position where the area vector is parallel to the field? The loop rotates from a position where its area vector makes an angle of 30° with the field to a position where the area vector is parallel to the field in 56.3 ms. What is the induced current through the light bulb? This square loop is rotated with a frequency of 60 Hz within a uniform magnetic field of 454 mT. This means the loop makes half a revolution in 8.33 ms. What is the induced current in the light bulb when the loop rotates from a position where its area vector is opposite the magnetic field to a position where its area vector is parallel to the magnetic field?
- The figure below shows a piece of insulated wire formed into the shape of a figure eight. You may consider the two loops of the figure eight to be circles, where the upper loop's radius is 3.00 cm and the lower loop's radius is 8.00 cm. The wire has a uniform resistance per unit length of 4.00 0/m. The wire lies in a plane that is perpendicular to a uniform magnetic field directed into the page, the magnitude of which is increasing at a constant rate of 2.50 T/s. (a) What is the magnitude of the induced current in the wire (in A)? A (b) Find the direction of the induced current in the wire. (Select all that apply.) O clockwise in the upper loop O clockwise in the lower loop O counterclockwise in the upper loop O counterclockwise in the lower loopYou’re an electrical engineer designing an alternator (the gener-ator that charges a car’s battery). Mechanical engineers specify a 10-cm-diameter rotating coil, and you determine that you can fit 250 turns in this coil. To charge a 12-V battery, you need a peak output of 14 V when the alternator is rotating at 1200 rpm. What do you specify for the alternator’s magnetic field?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 UnitsA flat circular coil of radius 7.22 cm and exactly 15 loops is rotated in a magnetic field of magnitude 1.02 T. What is the minimum angular velocity at which the coil can be rotated to achieve an EMF of 173 V on the coil?Refer To: Ref 22-2 Which one of the following statements concerning this situation is true? Since the circuit moves with constant speed, the force F does zero work. The induced current flows clockwise around the circuit. As the circuit moves through the field, the field does work to produce the current. If the circuit were replaced with a wooden loop, there would be no induced emf. The temperature of the circuit remains constant.
- 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 cmI want to generate an average emf of 10 V with a circular coil of wire with diameter 10 cm and 500 coils. How much time should I take to rotate the coil 90 degrees if the coil is in a magnet field of magnitude 9e-3 T? The loop starts flat on the xy plane and the magnetic field at this time is pointed in the positive x direction. The loop rotates about the y-axis. a) 0.00353 s b) 283.32 s c) 7.06E-6 s d) 3.54E-6 sAn clectron enters a region of space containing a uniform 1.25 x 10-5 T magnetic field. Its speed is 1.5 x 10° m/s when it enters perpendicularly to the ficld. Under these conditions, the clectron undergoes circular motion. (a) Find the radius r of the electron's circular path. (b) Find the frequency f of the circular motion. 2.