VLab_Magnetic_Force_on_Moving_Charges_2017.docx - Virtual Lab Magnetic Force on Moving Charges Name(s Ana Jimenez Laura Juarez Date Please enter your

VLab_Magnetic_Force_on_Moving_Charges_2017.docx - Virtual...

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Virtual Lab: Magnetic Force on Moving Charges Name ( s ) : Ana Jimenez, Laura Juarez Date : 12/19/2017 Please enter your answers in a font color other than black, red or green. Theory: In the early 19 th century, the French physicist André-Marie Ampère (1775-1836) showed that two wires carrying electric currents exerted forces on each other. These forces caused the wires to be attracted to each other (if the currents were in the same direction) or repel each other (if the currents were traveling in opposite directions.) Ampere showed that wires carrying currents create magnetic fields around them and it is these magnetic fields that exert the forces on the wires. The magnetic field created by one wire exerts a force on a neighboring wire and vice versa. Since electric currents are made up of electric charges in motion, this meant that a magnetic field exerts a force on a moving charge . The net force on the wire is the sum of the forces exerted on the individual charges moving within it. The magnitude of the force (F in newtons) felt by a wire of length (l meters) carrying a current of (I amperes) in a magnetic field of strength (B tesla or T) is given by the equation: F = IlBsin ( newtons ) … Equation 1 where is the angle between the direction of the current and the direction of the magnetic field. If is 90 , then sin(90 ) is 1, and the above equation becomes: F = IlB ( newtons ) … Equation 2 The force acting on the wire will increase if the current in the wire is increased, or the length of the wire is increased, or the magnetic field strength is increased. If the direction of the current is reversed then the wire will move in opposite direction. The
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