Problem 24.48 A device called a railgun uses the magnetic force on currents to l
ID: 1402990 • Letter: P
Question
Problem 24.48
A device called a railgun uses the magnetic force on currents to launch projectiles at very high speeds. An idealized model of a railgun is illustrated in . A 1.2 V power supply is connected to two conducting rails. A segment of copper wire, in a region of uniform magnetic field, slides freely on the rails. The wire has a 0.71 m? resistance and a mass of 4.8 g. Ignore the resistance of the rails. The power supply is switched on.
What is the current?
Problem 24.48
A device called a railgun uses the magnetic force on currents to launch projectiles at very high speeds. An idealized model of a railgun is illustrated in . A 1.2 V power supply is connected to two conducting rails. A segment of copper wire, in a region of uniform magnetic field, slides freely on the rails. The wire has a 0.71 m? resistance and a mass of 4.8 g. Ignore the resistance of the rails. The power supply is switched on.
What is the current?
15 cm | × × × 1.2V B = 0.80 TExplanation / Answer
Current = V/R
R = 0.71mohm = 0.71*10^-3 ohm
I = 1.2/0.71*10^-3
I = 1690A
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