The magnetic field 41.0 cm away from a long, straight wire carrying current 4.00 A is...

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Physics

The magnetic field 41.0 cm away from a long, straight wirecarrying current 4.00 A is 1950 nT.
(a) At what distance is it 195 nT?

(b) At one instant, the two conductors in a long householdextension cord carry equal 4.00-A currents in opposite directions.The two wires are 3.00 mm apart. Find the magnetic field 41.0 cmaway from the middle of the straight cord, in the plane of the twowires.

How far is the point of interest from each wire? nT

(c) At what distance is it one-tenth as large?
cm

(d) The center wire in a coaxial cable carries current 4.00 A inone direction, and the sheath around it carries current 4.00 A inthe opposite direction. What magnetic field does the cable createat points outside the cables?
nT

Answer & Explanation Solved by verified expert

4.0 Ratings (644 Votes)

Part A Magnetic field due to long current carrying wire is given by B u0I2pid From above equation we can see that magnetic field is inversely proportional to the distance from wire So B1B2 r2r1 r2 r1B1B2 r2 4101950195 410 cm So at distance 410 cm magnetic field will become 195 nT Part B Magnetic field See Answer

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