Eq2SheetLand

# Eq2SheetLand - Equation Sheet for Midterm Exam 2 ►...

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Unformatted text preview: Equation Sheet for Midterm Exam 2 ► Electric current dt dq i = ► Ohm’s law R V i = The resistance of a wire with length L and area A is R = ρ L/A where ρ = resistivity. ► Resistors in series n eq R R R R + + + = ⋯ 2 1 ► Resistors in parallel n eq R R R R 1 1 1 1 2 1 + + + = ⋯ ► Power. The power supplied by an emf device is P emf = i V emf . The power dissipated in a resistor is P = i V = i 2 R (Joule’s law). ► RC circuit with emf device. When the capacitor is being charged, [ ] RC t e emf CV t q / 1 ) (-- = ; when the capacitor is discharging, RC t e q t q / ) (- = . The time constant is τ = RC . (Recall C = q/V .) ► The magnetic force on a charged particle θ sin magnitude qvB q = × = B v F A charged particle in a uniform magnetic field moves on a circular trajectory, in accord with Newton’s second law: mv 2 /r = qvB . ► The magnetic force on a straight length of current carrying wire B L F × = i ► Magnetic dipoles . Torque = μ ×B ; potential energy = -...
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