After this activity you should know: • Biot-Savart law • the direction and magnitude of the magnetic field created by along straight thin current • be able to calculate magnetic field due to multiple currents.Magnetic fields are generated by moving charges or currents. Even apermanent magnet can be thought of as a large collection of current loopson an atomic scale.dsBiot-Savart Law: The Biot-Savart law gives the magnetic field dB at point Pdue to a small segment ds of a wire carrying a current I:HoI ds x îdBr2PHere r is the vector from the small segment ds to the point P. The directionof ds is the same direction as the current at position on the wireI1. A long straight thin wire carries current as shown. Use the Biot-Savartlaw and the right hand rule to determine the direction of the magneticfield at the points shown.dsWhat is the direction of the magnetic field at point 1(left/right/in/out/top/bottom/zero)? Hint: pick a small length ds ofthe current and draw the vector r from ds to point 1.а.b. What is the direction of the magnetic field at point 2(left/right/in/out/top/bottom/zero)?1Turn the long wire so the current is coming straight out of the page (shown on the diagram on the left). Drawarrows at each point x showing the direction of the magnetic field at that point. Repeat for the diagram on theright which shows the current going into the page.с.II

Subpart(a) Using the right hand rule. The direction of magnetic field at point 1 is out.

1. A long straight thin wire carries current as shown. Use the Biot-Savart law and the right hand rule to determine the direction of the magnetic field at the points shown. a. What is the direction of the magnetic field at point 1 (left/right/in/out/top/bottom/zero)? Hint: pick a small length ds of the current and draw the vectorr from ds to point 1. ds I b. What is the direction of the magnetic field at point 2 1 (left/right/in/out/top/bottom/zero)? Turn the long wire so the current is coming straight out of the page (shown on the diagram on the left). Draw arrows at each point x showing the direction of the magnetic field at that point. Repeat for the diagram on the right which shows the current going into the page. c.

1. A long straight thin wire carries current as shown. Use the Biot-Savart law and the right hand rule to determine the direction of the magnetic field at the points shown. a. What is the direction of the magnetic field at point 1 (left/right/in/out/top/bottom/zero)? Hint: pick a small length ds of the current and draw the vectorr from ds to point 1. ds I b. What is the direction of the magnetic field at point 2 1 (left/right/in/out/top/bottom/zero)? Turn the long wire so the current is coming straight out of the page (shown on the diagram on the left). Draw arrows at each point x showing the direction of the magnetic field at that point. Repeat for the diagram on the right which shows the current going into the page. c.