A conducting bar of mass m = 1kg and length I = 1m is in contact with a thin conducting circular ring as shown in the figure. The bar rotates about the pivot point o which is also the center of the ring. The ring and the bar are connected by a resistor R = 1N. A uniform magne tic field B = 1T is applied perpendicular to the rotating plane of the bar and the ring. The bar is released to rotate at t = O after reaching ini tial angular speed w, = 100rad/s. Find the angular speed w of the rod att = 4s. (Assume that there is a good electrical contact between bar and the ring and ignore friction forces).

A conducting bar of mass m = 1kg and length I = 1m is in contact with a thin conducting circular ring as shown in the figure. The bar rotates about the pivot point o which is also the center of the ring. The ring and the bar are connected by a resistor R = 1N. A uniform magne tic field B = 1T is applied perpendicular to the rotating plane of the bar and the ring. The bar is released to rotate at t = O after reaching ini tial angular speed w, = 100rad/s. Find the angular speed w of the rod att = 4s. (Assume that there is a good electrical contact between bar and the ring and ignore friction forces).

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter32: Faraday’s Law Of Induction

Section: Chapter Questions

Problem 73PQ

See similar textbooks

Similar questions

(a) What is the speed of a supersonic aircraft with a 17.0-m wingspan, if it experiences a 1.60V Hall voltage between its wing lips when in level flight over the north magnetic pole, where the Earth's field strength is 8.00105T ? (b) Explain why very little current flows as a result of this Hall voltage.
Figure P18.37 shows a simplified model of a cardiac defibrillator, a device used to patients in ventricular fibrillation. When the switch S is toggled to the left, the capacitor C charges through the resistor R .When the switch is toggled to the right, the capacitor discharges current through the patients torso, modeled as the resistor Rtorso, allowing the hearts normal rhythm to be reestablished. (a) If the capacitor is initially uncharged with C = 8.00 F and = 1250 V, find the value of R required to charge the capacitor to a voltage of 775 V in 1.50 s. (b) If the capacitor is then discharged across the patients torso with, Rtorso = 1250 , calculate the voltage across the capacitor after 5.00 ms. Figure P18.37
Two long, straight wires cross each other at right angles, andeach carries the same current as in Figure CQ19.18. Whichof the following statements are true regarding the totalmagnetic field at the various points due to the two wires?(There may be more than one correct statement.) (a) Thefield is strongest at points B and D. (b) The field is strongestat points A and C. (c) The field is out of the page at point Band into the page at point D. (d) The field is out of the pageat point C and out of the page at point D. (e) The field hasthe same magnitude at all four points.
a)Two 2.0 m long parallel wires, P and Q are separated by a distance of 20 mm, carrying currents of 5.5 A and 2.2 A respectively in opposite directions. iii. Determine the magnitude and direction of the force exerted on the wire P. iv. Explain how to determine direction of force on wire P. b)An alternating voltage is given by ? = 340 sin 314?, where V is measured in volts and t in seconds. This voltage is supplied across a pure capacitor of 200 ??. i. Determine the rms voltage.
Two atoms of the same substance, one singly ionized and the other triply ionized, are eachaccelerated from rest through same potential difference. The ions enter the same uniformmagnetic field at 90o. Derive an expression fora) their velocity (V2/ V1) entering the field.b) their radii (r2/ r1) of curvature in the field.
In the figure below, a current i = 28 A is set up in a long hairpin conductor formed by bending a wire into a semicircle of radius R = 9.0 mm. Point b is midway between the straight sections and so distant from the semicircle that each straight section can be approximated as being an infinite wire. (a) What is the magnitude of B (vector) at a? ___________T(b) What is the direction of B (vector) at a? 1) into the page 2) out of the page (c) What is the magnitude of B (vector) at b? ____________T(d) What is the direction of B (vector) at b? 1) into the page 2) out of the page (please show units. It really helps me out)
(I) A thin 12-cm-long solenoid has a total of 460 turns ofwire and carries a current of 2.0 A. Calculate the field insidethe solenoid near the center.
Two atoms of the same substance, one singly ionized and the other triply ionized, are eachaccelerated from rest through same potential difference. The ions enter the same uniformmagnetic field at 90 degrees. Derive an expression fora) their velocity (V2/ V1) entering the field. b) their radii (r2/ r1) of curvature in the field.
Two parallel copper conductors are each 0.700 m long. They carry currents of 10.0 A in opposite directions. a) What separation between their centers must have conductors if they are to repel each other with a force of 1.00 N? b) Is this situation physically possible? Explain.
A segment of wire 7.9 cm long is moving at a velocity of 5.85 m/s toward a parallel (much longer) wire which carries a current of 9.92 A. At a particular instant the wire segment is 6.9 cm away from the long, current-carrying wire. What is the induced emf (voltage) between the two ends of the wire segment? 5.32E-06 V 1.06E-05 V 1.60E-05 V 1.33E-05 V
In the figure, there is a cross section of two cylindrical conductor wires that are intertwined.Radius c of inner wire, inner wire of outer wire radius b and outer radius a. The current x, whose direction is outward from the page, is evenly distributed along the inner cylinder. In the outer cylinder, the same current is in the opposite direction.From Ampere's law by making use of, a) r<a b)c<r<b c)b<r<a d)r>a
What Hall voltage is produced by a 0.180-T field applied across a 2.6-cm diameter aorta when blood velocity is 55.0 cm/s? (in mV)