PHYS 6B Lecture Notes - Lecture 14: Solenoid

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27 Aug 2016

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The magnetic field lines due to a long, straight current carrying wire are circles that ie in planes perpendicular to the axis of the wire. The magnetic field vectors are tangential to the circular magnetic field lines and perpendicular to the axis of the wire. Magnitude of the field is proportional to the current and inversely proportional to the distance r from the axis of the wire. Magnetic field lines always close on themselves. Ex: the magnetic field due to the current carrying wire points in the _______ direction at. P1 and points in the _______ direction at p2. B1 will act to the right and b2 will also act to the right. Having parallel wires with current acting in the same direction the magnetic field will cancel each other out. If you have two sources of magnetic fields then it is the vector sum.

Related Questions

1 - A compass in a magnetic field will line up __________.

(A) - with the north pole pointing perpendicular to the magnetic field

(B) - with the north pole pointing opposite the direction of the magnetic field

2 - The magnetic field lines due to a straight, current-carrying wire are __________.

(A) - straight lines parallel to the wire

(B) - circles around the wire

3 - Two parallel wires carry a current in the same direction. There is ___________ between the wires.

(A) - a repulsive force

(B) - no force

4 - The direction of the magnetic force on a moving charged particle in a magnetic field is __________.

(A) - both perpendicular to the velocity and perpendicular to the magnetic field

(B) - perpendicular to the magnetic field

burgundycicada286

Two long, straight, parallel wires carry currents that are directed perpendicular to the page as shown in Figure P30.9. Wire 1 carries a current I₁, into the page (in the negative z-direction), and passes through the x-axis at x = +α. Wire 2 passes through the x-axis at x = –2a and carries an unknown current I₂. The total magnetic field at the origin due to the current-carrying wires has a magnitude The current I₂ can have either of two possible values, Find the value of with the smaller magnitude, stating it in terms of I₁, and giving its direction.

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erinporpoise800

two very long straight parallel wires carry currents that are directed perpendicular to the page as shown in the figure. Wire 1 carries current I₁ into the page in the negative direction and passes through the x-axis at x=+a. Wire 2 passes through the x-axis at x=-2a and carries an unknown current I₂. The total magnetic field at the origin due to the current-carrying wire has the magnitude The current I₂ can have either of two possible values.