A coil rotating perpendicularly to a uniform magnetic field contains 290 turns and has an area per turn of 3.3 × 10-3 m2. The magnetic field is 0.15 T, and the current in the coil is 0.15 A. A brake shoe is pressed perpendicularly against the shaft to keep the coil from turning. The coefficient of static friction between the shaft and the brake shoe is 0.53. The radius of the shaft is 0.014 m. What is the magnitude of the minimum normal force that the brake shoe exerts on the shaft?
(I got 2.59 N, but its incorrect)
A coil rotating perpendicularly to a uniform magnetic field contains 290 turns and has an area...
The coil in the figure below contains 433 turns and has an area per turn of 3.30 10-3 m2. The magnetic field is 0.24 T, and the current in the coil is 0.24 A. A brake shoe is pressed perpendicularly against the shaft to keep the coil from turning. The coefficient of static friction between the shaft and the brake shoe is 0.72. The radius of the shaft is 0.010 m. What is the magnitude of the minimum normal force...
17312332 Consult Interactive Solution 21.51 to see how this problem can be solved The coil in the figure below contains 377 turns and has an area per turn of 3.00 x 103 m2. The magnetic field is 0.24 T, and the current in the s pressed perpendicularly against the shaft to keep the colil from turning. The coefficient of static friction between the The radius of the shaft is o.013 m. What is the magnitude of the minimum normal force...
points C/10 21 y Notes Ask Your Consult Interactive Solution 21.51 to see how this problem can be solved s an area per turn of 3.40 x103 m2. The magnetic field is 0.24 T, and the current in the coll is 0.24 A. A brake shoe is pressed perpendicularly against the shaft normal force that the brake shoe exerts on the shaft? to keep the coil from turning. The coefficient of static friction between the shaft and the brake shoe...
A circular coil (800 turns, radius = 0.040 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.028 s, the normal makes an angle of 45o with the field because the coil has made one-eighth of a revolution. An average emf of magnitude 0.094 V is induced in the coil. Find the magnitude of the magnetic field at the location of the...
A flat coil of wire consisting of 20 turns, each with an area of 10 cm, is positioned perpendicularly to a uniform magnetic field that varies with time according to B=2.5 f. where t is measured in s and B in T. If the coil has a total resistance of 0.10 9, what is the magnitude of the induced current at 0.8s? a. 0.20 A b. 0.60 A c. 0.50 A d. 0.80 A e. None of the above At what frequency...
A coil of 255 turns and area 0.500 m2 rotates in a uniform magnetic field B = 0.350 T such that the angle between the magnetic field and the area vector is given by φ(t) = 6.50t rad. If the coil starts from rest at t = 0, what is the magnitude of the emf induced in the coil at t = 25.8 s?
A generator is constructed by rotating a coil of N turns in a magnetic field B at a frequency f. The internal resistance of the coil is R and the cross sectional area of the coil is A. The average induced EMF doubles if the magnetic field B is doubled. The average induced EMF doubles if the area A is doubled. The average induced EMF doubles if the frequency f is doubled. The average induced EMF doubles if the resistance...
A generator is constructed by rotating a coil of N turns in a magnetic field B at a frequency f. The internal resistance of the coil is R and the cross sectional area of the coil is A. True or False 1. The average induced EMF doubles if the resistance R is doubled 2. The average induced EMF doubles if the magnetic field B is doubled 3. The maximum induced EMF occurs when the coil is rotated about an axis...
A generator is constructed by rotating a coil of N turns in a magnetic field B at a frequency f. The internal resistance of the coil is R and the cross sectional area of the coil is A. Which of the following statements are true? (Give ALL correct answers, i.e., B, AC, BCD...) A) The maximum induced EMF doubles if the frequency f is doubled. B) The maximum induced EMF doubles if the magnetic field B is doubled. C) The...
instrum.. x May 20, าร Question 3 The coil of a moving coil galvanometer (used in strip chart recorder) has 40 000 turns and is suspended in a uniform magnetic field of 0.18T. The control constant is 0.CISN-m per radian. The coil is 60mm wide and 30mm high with a momeni of inertia of 0.005 kg-m The damping constant is 0.014 N-m per radian per second and the coulomb friction is 0.13 x10 N.m. Determine e current required in the...