Name the physical quantity having unit J/T.

Explanation

To find the physical quantity that has the unit of joules per tesla (J/T), we can follow these steps:

### Step 1: Understand the Units
- Joule (J) is the unit of energy.
- Tesla (T) is the unit of magnetic field strength.

### Step 2: Relate Energy to Magnetic Field
- The potential energy (U) of a magnetic dipole (with magnetic moment m) in a magnetic field (with magnetic field strength B) is given by the formula:
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