A wire carrying a 27 A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.37 N force on the 4.5 cm of wire in the field. What is the average field strength? Average field strength in tesla = (b) A spherical surface of area 0.8m2, emissivity 0.92 and temperature 114°C is placed in a large, evacuated chamber whose walls are maintained at a fixed temperature. Find the rate at which radiation is emitted by the surface?( Stefan's constant σ = 5.67 x 10-8 W/m2T4 ) Energy radiated per second in watts =

A wire carrying a 27 A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.37 N force on the 4.5 cm of wire in the field. What is the average field strength? Average field strength in tesla = (b) A spherical surface of area 0.8m2, emissivity 0.92 and temperature 114°C is placed in a large, evacuated chamber whose walls are maintained at a fixed temperature. Find the rate at which radiation is emitted by the surface?( Stefan's constant σ = 5.67 x 10-8 W/m2T4 ) Energy radiated per second in watts =

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 48P: A strip of copper is placed in a uniform magnetic field of magnitude 2.5 T. The Hall electric field...

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Similar questions

A square loop whose sides are 6.0-cm long is made with copper wire of radius 1.0 mm. If a magnetic field perpendicular to the loop is changing at a rate of 5.0 mT/s, what is the current in the loop?
A strip of copper is placed in a uniform magnetic field of magnitude 2.5 T. The Hall electric field is measured to be 1.5103V/m (a) What is the drift speed of the conduction electrons? (b) Assuming that n =8.01028 elections per cubic meter and that the cross-sectional area of the strip is 5.0106m2 , calculate the current in the ship, (c) What is the Hall coefficient 1/nq?
Unreasonable results Frustrated by the small Hall voltage obtained in blood flow measurements, a medical physicist decides to increase the applied magnetic field strength to get a 0.500-V output for blood moving at 30.0 cm/s in a 1.50-cm-diameter vessel. (a) What magnetic field strength is needed? (b) What is unreasonable about this result? (C) Which premise is responsible?
A solenoid with an iron core is 25 cm long and is wrapped with 100 turns of wire. When the current through the solenoid is 10 A, the magnetic field inside it is 2.0 T. For this current, what is the permeability of the iron? If the current is turned off and then restored to 10 A, will the magnetic field necessarily return to 2.0 T?
A loop of wire moves with a velocity of 3.0 m/sm/s through a magnetic field whose strength decreases with distance at a rate of 5.0 μT/m�T/m. If the loop has an area of 0.75 m2m2 and internal resistance of 0.50 ΩΩ, what is the current in the wire?
what is the rate of energy dissipation by ohmic heating for a neodymium magnet of mass m=6.2 g and terminal velocity of 0.075 m/s?
1. The force on a wire carrying 8.75 A is a maximum of 1.28 N when placed between the pole faces of a magnet. If the pole faces are 75.4 cm in diameter, what is the approximate strength of the magnetic field? 2. A 60 W fluorescent bulb has resistance of about 12 Ω when cold (30˚C) and 120 Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivityα = 0.0080(C˚)-1.
In an experiment designed to measure the Earth’s magnetic field using the Hall effect, a copper bar 0.500 cm thick is positioned along an east-west direction. Assume it n = 8.46 × 1028 electrons/m3 and the plane of the bar is rotated to be perpendicular to the direction of → B. If a current of 8.00 A in the conductor results in a Hall voltage of 5.10 × 10–12 V, what is the magnitude of the Earth’s magnetic field at this location?
A loop of area 1.27 m2 is in a uniform 2.11 T magnetic field. If the flux through the loop is 0.878 T·m2, what angle (in degrees) does the normal to the plane of the loop make with the direction of the magnetic field?
A magnetic field is oriented at an angle of 57 ∘ to the normal of a rectangular area 4.8 cm by 6.6 cm . If the magnetic flux through this surface has a magnitude of 4.5×10−5 T⋅m2 , what is the strength of the magnetic field in mT?
The magnetic field at Earth's poles is approximately 60 microteslas, and the Earth has a radius of 6400 km. What is the order of magnitude of the current that must be present inside the Earth to generate this magnetic field?
A 48 turn coil of wire creates a circular area of 6.95 cm2. If a magnetic field of 90.79 T hits this area at a right angle, what is the magnetic flux (in Wb) through the coil?