Practice: A thin rod moves in a perpendicular, unknown magnetic field. If the length of the rod is 10 cm and the induced EMF is 1 V when it moves at 5 m/s, what is the magnitude of the magnetic field?

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Practice: A thin rod moves in a perpendicular, unknown magnetic field. If the length of the rod is 10 cm and the induced EMF is 1 V when it moves at 5 m/s, what is the magnitude of the magnetic field?

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A jumbo jet with wing span (distance between the wing tips) of 30 meters is cruising with speed of 2000 km/hour. Suppose that the earth's magnetic field is 0.5 x 10-4 Tesla and is perpendicular plane's wing span. What is the induced emf between plane's wing tips?

A square, 60-turn coil 10.0 cm on a side with a resistance of 0.920 Ω is placed between the poles of a large electromagnet. The electromagnet produces a constant, uniform magnetic field of 0.600 T directed into the page. As suggested by the figure below the field drops sharply to zero at the edges of the magnet. The coil moves to the right at a constant velocity of 2.00 cm/s. What is the current through the wire coil before the coil reaches the edge of the field? (Express your answer to two significant figures.)

A metal bar is moving toward the bottom of the page, as shown in the sketch. The bar is in a uniform magnetic field B that is directed into the page. Which end of the bar, a or b, is at higher potential?
(a) a
(b) b
(c) a and b are at the same potential

A metal bar is pulled to the right perpendicular to a uniform magnetic field. The bar rides on parallel metal rails connected through a resistor, as shown in the figure below, so the apparatus makes complete circuit. Find the direction of the current induced in the circuit in two ways:
a) By looking at the magnetic force on the charges in the moving bar.
b) Using Lenz's Law

A 10 cm long zero resistance wire is pushed towards the 2.0 Ω resistor with a steady speed of 0.5 m/s as shown in the figure below. A magnetic field of 0.5 T is directed out of the page as shown. What is the rate of change of flux?A) ZeroB) 0.025 T•m2/sC) 0.115 T•m2/sD) 0.05 T•m2/sE) None of the above

A conducting rod of length 0.20 m makes slides without friction on conducting metal rails, as shown in the sketch. The apparatus is in a uniform magnetic field that has magnitude B = 0.400 T and that is directed into the page. The resistance of the circuit is a constant R = 5.00 Ω.
What magnitude and direction (to the left or to the right) of the external force must be applied to the bar to keep it moving to the right at a constant speed of 12.0 m/s?

A conducting rod of length 0.20 m makes slides without friction on conducting metal rails, as shown in the sketch. The apparatus is in a uniform magnetic field that has magnitude B = 0.400 T and that is directed into the page. The resistance of the circuit is a constant R = 5.00 Ω.In a 3.00 s interval, how much work does the external force do on the bar if the bar is moving with constant velocity 12 m/s?

A bicycle generator rotates at 1900 rad/s, producing an 18.0 V peak emf. It has a 1.00 cm by 3.00 cm rectangular coil in a 0.770 T field.(a) How many turns are in the coil?(b) Is this number of turns practical for a 1.00 cm by 3.00 cm coil?Yes / No

Which of the following will cause an induced current in a coil of wire?a) the constant field of the earth passing through the coilb) a magnet resting near the coilc) a magnet being moved into or out of the coild) a wire carrying a constant current near the coil

(a) An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner’s 2.00 T field with his fingers pointing in the direction of the field. Find the average emf induced in his wedding ring, given its diameter is 2.20 cm and assuming it takes 0.250 s to move it into the field. (b) Discuss whether this current would significantly change the temperature of the ring.

A 10cm long wire is pulled along a U shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.20 Ohm. Pulling the wire with a force of 1.0 N causes 4.0 W of power to be dissipated in the circuit. What is the speed of the wire when pulled with a force of 1.0 N? What is the strength of the magnetic field?

The earth's magnetic field strength is 5.0x10-5 T. How fast would you have to drive your car to create a 4.0 V motional emf along your 1.0 m -long radio antenna? Assume that the motion of the antenna is perpendicular to .

A scalloped hammerhead shark swims at a steady speed of 1.0 m/s with its 80 -cm-wide head perpendicular to the earth's 56µT magnetic field.What is the magnitude of the emf induced between the two sides of the shark's head?Express your answer using two significant figures.

The loop in the figure is being pushed into the 3.00 T magnetic field at 10.0 m/s. (a) The resistance of the loop is 2.46 Ω. What is the magnitude of the current in the loop? (b) What is the direction of the current in the loop?

The cube shown in the figure below, 50.0 cm on a side, is in a uniform magnetic field of B = 0.125 T , directed along the positive y-axis. Wires A, C, and D move in the directions indicated, each with a speed of 0.370 m/s . (Wire A moves parallel to the xy-plane, C moves at an angle of 45.0° below the xy-plane, and D moves parallel to the xz-plane.) a. What is the potential difference between the ends of wire A? b. What is the potential difference between the ends of wire C? c. What is the potential difference between the ends of wire D?

The figure shows emf phasors a, b, and c.Part AFor each, what is the instantaneous value of the emf?Part BAt this instant, is the magnitude of emf represented by phasor a increasing, decreasing, or holding constant?

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