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Torque on A Current Carrying Loop Physics 12 Adv Force on a Current Carrying Wire in a Magnetic Field Take the equation for the force experienced by a charged particle moving in a magnetic field and the definition of current to develop an equation for a current carrying wire in a magnetic field F IB Torque We recall that torque is the cross product of radius and force The units are Nm but are not joules! The direction is positive for ccw and negative for cw r F rF sin Torque on a Current Carrying Loop Galvanometer The force experience by a current carrying wire in a magnetic field can be used to build a galvanometer Based on the length of wire, the strength of the field, the tension in the spring and the current, different readings are obtained Galvanometer Show that it is imperative that a galvanometer used as an ammeter must have negligible resistance compared to the effective resistance of the circuit and that a galvanometer used as a voltmeter must have infinite resistance Example You build a circuit that consists of a 15Ω resistor and a 1.5V battery. – Determine the current in the resistor You know place an ammeter is series with the resistor that has a resistance of 1.0Ω and a voltmeter in parallel that has a resistance of 150Ω. – Determine the new current in the resistor