Secure mastering physics.com/myctitemview?assignment Problem D 77214497&offset;
ID: 1603386 • Letter: S
Question
Secure mastering physics.com/myctitemview?assignment Problem D 77214497&offset; prev 062 Spring 2017 section 3 esW9-Part 2 (Chaplet 26) Problem 28 51 Problem 28.51 Part A Three long parallel wires are 3.5 cm from one another Determine the magnitude of magnetic force per unit length on wire M due to the other two (Looking along them, they are at three corners of an equilateral triangle.) The current in each wire is 8.60 A but Express your answer to two significant figures and include the appropriate units. its direction in wire M is opposite to that in wires N and P (see the figure) (Figure 1) FM Value Units of 1 Submit incorrect; Try Again: 5 attempts nehing Part B Determine the direction of magnetic force per unit length on wine M due to the other two Express your answer to two significant figures and include the appropriate units. a ca 3.5 cm counterclockwise from the positive SubmitExplanation / Answer
a)The side components of forces from other two wires cancels.The magnetic force on M due to other two will be:
F(m)/L = 2 (F/L) cos(30)
where, F/L = mu0 I1 I2 / 2 pi r
F/L = 4 pi x 10-7 x 8.6 x 8.6 / 2 pi x 0.035 = 4.23 x 10-4 N/m
F(m)/L = 2 x 4.23 x 10-4 x cos30 = 7.33 x 10-4 N/m
Hence, F(m)/L = 7.33 x 10-4 N/m
b)theta = tan-1 [(F/L)cos30/(F/L)cos(30)] = 45 deg
Hence, theta = 45 deg