Physics
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![](data:image/png;base64,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)
What is its resistance across AB?
The correct answer is: ![fraction numerator p b over denominator a c end fraction](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB0AAAAkCAYAAAB15jFqAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAAAXQ/cXWQAAAXtJREFUeNpjYKAO+AbETAx0BCpAfImBziAAiJdTy7B6IK4G4kYgfg7EP4B4PxBLkqmOKLAKiO8CcTkQC0LjrA+Lr4hVRxS4BcRaaGJ8QPyJTHUEARM0RaIDDjTDiFVHFDCHxgs6sATivWSoIwpEAvF8LOJFQFxLhjqiwCQgTkQTY4PmR0ky1BEF1kETiAuULw0VSyRTHVHgHTTTgwz8A8QXoHx08BKI/YhQRxCwQS2lK/CCBhFdQTw0gYwCqoL/dMCjYBSMgmEEmKDNS1A19gtafcljUccDxF1A/BSqbh20dUgW2AKtAGDNy1VY6kyQheeAuBXaEgRVjyVA7EOOhZFQS5DBQmj1hww6qFkz7Ye27JDBQbTgBfn+NSVBSag3BmJ/QVNjCsSHqZmIXqPxraFxR9OWxlNoax0GQG3ZNWhqjIH4BjUtbQbimdBgBcXjUiDehkXdBWjKZYGm3gJoqJANqqEpuBbq65dYsowsNIH9gTa0k6ldWIhSagAAtcFz0iGsZ58AAACQdEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1mcmFjPjxtcm93PjxtaT5wPC9taT48bWk+YjwvbWk+PC9tcm93Pjxtcm93PjxtaT5hPC9taT48bWk+YzwvbWk+PC9tcm93PjwvbWZyYWM+PC9tYXRoPrXnBt4AAAAASUVORK5CYII=)
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