Lab 6 B-Field Plotting he local ( permanent ) magnet with its center on the orig

Question

Lab 6 B-Field Plotting he local ( permanent ) magnet with its center on the origin and its N' pole facing East he -axis as shown in figure 2 Draw its outline on the paper then label it. Fasten the magnet jown with tape to prevent movement, s. Place the compass's 'S-pole' at the end of the permanent magnet's 'N-pole', right in the middle. Mark a dot at the other end of the compass needle. 9. Move the compass so the compass's 'S' is at the previous N'. Continue connecting the dots like this until you reach the permanent magnet's 'S', or they go off the paper's edge. 10. Connect the dots with a smooth curve and indicate the direction of Br with an arrow head. Fig.3 Positioning the Magnet shown in 11. Plot the following starting angles from the N pole on the brown wraping paper as Do a similar set from the S pole. This B-field plot will be submitted and will be graded on accuracy, completeness, and neatness. 4 71 Fig.4 Plotting the Field Lines 9a. Can Br 0? If so, where? b. What is your reasoning?

Explanation / Answer

9. From the diagram

a. in the vicinity of a bar magnet the magnetuc field is never 0 at any location (unless a different magnet is present inthe surroundings)

so at locations to about 40 - 50 degrees of the south or the north pole, as some large distance from the magnet there will be a position where Bt can be 0

b, the reason for this phenomenon can be magnetic fiel cdof the earth. for som location if the magnetic field of earth is antiparallel to the magentic field line of the permanent magnet and has the same magnitude, then the net magnetic field at that point in space will have 0 magnitude

hecne Bt = 0

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