A flat loop of wire consisting of a single turn of cross-sectional area 7.00 cm² is perpendicular to a magnetic field that increases uniformly in magnitude from 0.500 T to 2.20 T in 0.96 s. What is the magnitude of the resulting induced current if the loop has a resistance of 1.90 0? mA
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- A helicopter has blades with a length of L=4 m. They are in the Earth's magnetic field, which is B = 0.6 × 10−¹T. If they spin at an angular speed of 15 rev/s about the center axis (which is connected to the motor), and the magnetic field lines are perpendicular to the plane of the rotor blades, what is the magnitude of the induced EMF between the blade tip and the central axis? The induced EMF is equal to ? +A ring of radius r = 0.24 m is made of copper wire (cross-sectional area of the wire A = 0.65 x 10-6m²). The ring is placed in a uniform magnetic field whose direction is perpendicular to the page, into the page. The magnetic field increases in time according to the equation: B = 3.0t, where B is in teslas and time is in seconds. Determine the magnitude and direction of the induced current in the copper ring at room temperature (20°C) and at -200°C. Resistivity for copper is p = 1.69 x 10-® Nm and the temperature coefficient of resistivity for copper is a = 3.86 x 10-3 хх x x X X x X ххA 35.6-meter-long spacecraft flies past a neutron star, and passes through the neutron star s extremely powerful magnetic field of strength 7.95 x 10^4 T. The spacecraft travels at a velocity of 2.43 km/s in a direction perpendicular to the magnetic field; the spacecraft s long axis is also perpendicular to the magnetic field. What is the induced emf (voltage) between the two ends of the spacecraft? 6.88E+08 V 6.88E+09 V 6.88E+06 V 6.88E+05 V
- Consider the Hall voltage induced on a patient’s heart while being scanned by an MRI unit. l = 8.5 cmv = 7.5 cm/s Approximate the conducting path on the heart wall by a wire 8.5 cm long that moves at 7.5 cm/s perpendicular to a 1.50 T magnetic field. Find the Hall voltage across the patient's heart in mV.Below is a closed conducting loop within a magnetic field (for direction see picture). The loop is a circle with a radius of r = 7.00 cm. The magnetic field is decreasing in the direction shown at a rate of dB/dt = 169.0 mT/s. The circle wire has 270.0 loops around it. The wire has a total resistance of R = 11.80 Ohms.Pulsars, or neutron stars, rotate at a fairly high speed, and they are surrounded by strong magnetic fields. The material in neutron stars is a good conductor, and hence a motional emf is induced between the center of the neutron star and the rim. Suppose that a neutron star of radius 12 km rotates at the rate of 35 rev/s and that the magnetic field has a strength of 1.00 x 108 T. What is the emf induced between the center of the star and a point on its equator?
- A circular loop is hanging on the wall. It has a radius of 33.3 cm and is comprised of ) 12 coils. There is a magnetic field perpendicular to the wall, coming out of the wall, that grows from 1.5 T to 7.5 T in 3.0 seconds. The coil has a resistance of 3.752, what is the magnitude and direction of the induced current in the coil?A single loop of copper wire, lying flat in a plane, has an area of 7.20 cm2 and a resistance of 1.80 N. A uniform magnetic field points perpendicular to the plane of the loop. The field initially has a magnitude of 0.500 T, and the magnitude increases linearly to 1.50 T in a time of 1.12 s. What is the induced current (in mA) in the loop of wire over this time? 3.57 You may have neglected to convert units. Be sure to convert the area from cm2 to m2. Then, convert the current from A to mA. mA Need Help? Read ItA square conducting hoop with side length 1.41 m is placed in a uniform magnetic field that points out the page. The loop lies perpendicular to the field. If the resistance of the loop is 4 w what is the magnitude and direction of the induced current as the magnetic field increases steadily from 2.0 T to 4.0 T in 10.0 seconds