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friday_rev

# friday_rev - Physics 7B Spring 2010 Final Exam Review...

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Physics 7B, Spring 2010 Final Exam Review Session (Friday) Peter Battaglino Problem 1: A magnetohydrodynamic drive, or MHD drive for short, utilizes a strong magnetic field to propel a conducting fluid out of the back of a vehicle. For example, the vehicle might be a space-craft, and the conducting fluid might be an ionized plasma, or the vehicle could be a submarine and the conducting fluid ocean water. Two magnets create a magnetic field B pointing downwards, and a battery is used to keep a voltage V between two conducting pads, causing a current to flow through the fluid between the pads. Supposing that the pads have area A , that they are separated by a distance L , and that the fluid has conductivity σ , compute the magnitude and direction of the propulsion force created by the MHD drive. Figure 1: Problem 1: An MHD drive. Problem 2: You have a solenoid of radius R and length L . However, the number of turns per unit length varies with the length z along the solenoid as n ( z ) = n 0 z/L . Compute the inductance of the solenoid.

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friday_rev - Physics 7B Spring 2010 Final Exam Review...

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