What is the magnetic field strength at a distance of 0.1 m from a long straight
Practice Questions
Q1
What is the magnetic field strength at a distance of 0.1 m from a long straight wire carrying a current of 5 A?
0.1 T
0.01 T
0.05 T
0.02 T
Questions & Step-by-Step Solutions
What is the magnetic field strength at a distance of 0.1 m from a long straight wire carrying a current of 5 A?
Step 1: Identify the formula to calculate the magnetic field strength (B) around a long straight wire. The formula is B = (μ0 * I) / (2 * π * r).
Step 2: Determine the values needed for the formula. Here, μ0 (the permeability of free space) is 4π x 10^-7 T m/A, I (the current) is 5 A, and r (the distance from the wire) is 0.1 m.
Step 3: Substitute the values into the formula. Replace μ0 with 4π x 10^-7, I with 5, and r with 0.1.
Step 4: Calculate the numerator: 4π x 10^-7 * 5.
Step 5: Calculate the denominator: 2 * π * 0.1.
Step 6: Divide the result from Step 4 by the result from Step 5 to find B.
