Which of the following is true with reference to semi-infinite tape using a two track tape?

Which of the following is true with reference to semi-infinite tape using a two track tape? Correct Answer All of the mentioned

The upper track represents the cells of the original TM that are at the right of the initial head position. The lower track represents the cells to the left of the initial head position, but in reverse order.

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The work done in bringing a charge +q from infinity in free space, to a position at a distance d in front of a semiinfinite grounded metal surface is