Question
Physies 2135 Special Homework Assignment Consider a l ,5 V bettery with a 0.3 resiste mached to two conducting, drictionless rails 0.200 m apart. The entire appeeatus is in a unifoem magnetic tield B directed out of the page und of magnitade 0.400 T perpendicular to the rails. A conducting bar can slide over the rails perpendicular to them as well ns to the field. All other resistances in the problem are negligible empared to the 0.3 resistor The bar is placed on the rails, starts froen rest, and is observed to accelernne. 1.5V 036 (a) What is the direction of the bar's acceleration? (b) What is the directicn of the emf ieduced in the bar? (c) Use Faraday's Law to calculate the magnitude of the induced emf when the har reaches a speed of 12.0 m's (d) Calculate the current in the bar when its speed is 12.0 m/'s
Explanation / Answer
a) towards left (-x axis)
b) counterclockwise
c) Iduced emf = B*v*L
= 0.4*12*0.2
= 0.96 volts
d) I = (1.5 - 0.96)/0.3
= 1.8 A