# c251_12 - MAGNETIC FORCES AND TORQUES (Chapter 8) MAGNETIC...

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1 1 Experimental facts: – Two wires carrying current in the same direction attract. Two wires carrying current in the opposite directions repel. – A short current carrying wire oriented perpendicular to a long current-carrying wire experiences no force. I 1 I 2 F 1 F 2 I 1 I 2 F 1 F 2 – The magnitude of the force is inversely proportional to the distance squared. Ampere’s Law of Force I 1 I 2 F 2 =0 MAGNETIC FORCES AND TORQUES (Chapter 8) 2 Magnetic Forces on Moving Charges • The force on a charged particle Q moving with velocity u in a magnetostatic field characteristic by magnetic flux density B is given by B x u Q F m r r r = • The magnitude and direction of the magnetic force depends on – the velocity and direction of the moving particle – the sign and magnitude of the charge on the particle – the magnitude and direction of the magnetic field –F m is max if u and B are perpendicular –F m = 0, if u, Q or B is zero OR if u and B are parallel MAGNETIC FORCES B u F Q 3 • Direction of the Force is perpendicular to both u and B • Force follows the Right-Hand Rule B x u Q F m r r r = MAGNETIC FORCE u 4 Magnetic force accelerates charges but does not change the kinetic energy ( Δ KE)! Since

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## This note was uploaded on 07/11/2011 for the course ELEC 251 taught by Professor Lynch during the Spring '10 term at Concordia Canada.

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c251_12 - MAGNETIC FORCES AND TORQUES (Chapter 8) MAGNETIC...

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