For two vectors \(\vec A\) and \(\vec B\), |\(\vec A\)+\(\vec B\)|=|\(\vec A\) - \(\vec B\)| is always true when:
| (a) | |\(\vec A\)| = |\(\vec B\)| ≠ \(0\) |
| (b) | \(\vec A\perp\vec B\) |
| (c) | |\(\vec A\)| = |\(\vec B\)| ≠ \(0\) and \(\vec A\) and \(\vec B\) are parallel or antiparallel. |
| (d) | when either |\(\vec A\)| or |\(\vec B\)| is zero. |
| 1. | (a), (d) |
| 2. | (b), (c) |
| 3. | (b), (d) |
| 4. | (a), (b) |
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