Torque on Charges in an Electric Field

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Homework Help Overview

The problem involves calculating the maximum possible torque on a dipole formed by two charged spheres in a uniform electric field. The subject area includes concepts of electrostatics and torque in physics.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the torque formula t = qEL but questions the correctness of their unit conversion, specifically whether torque is measured in Joules.

Discussion Status

Some participants provide feedback on the unit of torque, indicating that it is measured in Newton-meters (Nm) rather than Joules. The discussion appears to be focused on clarifying the original poster's understanding of units rather than progressing towards a solution.

Contextual Notes

The original poster expresses uncertainty about their calculations and the appropriate units for torque, which may indicate a need for further clarification on the concepts involved.

Mitchtwitchita
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Homework Statement



Two small plastic spheres, one charged to 17 nC and the other to -17 nC, are connected by a 25-mm long insulating rod. Suppose this dipole is placed in a uniform electric field with strength 7.4 x 10^5 N/C. What is the maximum possible torque on the dipole?

Homework Equations



t = qEL


The Attempt at a Solution



t = qEL
=(17 x 10^-9 C)(7.4 x 10^5 N/C)(2.5 x 10^-2 m)
=3.15 x 10 ^-4 J
This can't be right. Is torque measured in Joules? Can somebody please help me out with this problem?
 
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Your unit is Nm, which is right for torque, not the equivalent J for energy.
 
How about the solution?
 
Looks correct to me.
 

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