What will happen if the guy in our example, who picks up balls from below and puts it on top of the C-shaped tube, stops doing his job?

The balls will have no one to pick them up, the current will stop.

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The current will be there even without him doing anything.

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The balls will start going backwards.

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None of these

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Solution

The correct option is A
The balls will have no one to pick them up, the current will stop.

The balls move to fill the 'gap' created by our guy when he picks one up from the bottom. The current will stop flowing as there would be no more 'gap' to fill and the balls would remain stationary.

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​What will happen if the guy in our example, who picks up balls from below and puts it on top of the C-shaped tube, stops doing his job?

The correct option is A The balls will have no one to pick them up, the current will stop. The balls move to fill the 'gap' created by our guy when he picks one up from the bottom. The current will stop flowing as there would be no more 'gap' to fill and the balls would remain stationary.

What will happen if the guy in our example, who picks up balls from below and puts it on top of the C-shaped tube, stops doing his job?

The correct option is A
The balls will have no one to pick them up, the current will stop.

The balls move to fill the 'gap' created by our guy when he picks one up from the bottom. The current will stop flowing as there would be no more 'gap' to fill and the balls would remain stationary.