Two long, parallel wires, fixed in space, carry currents I1 and I2. The force of attraction has magnitude F. What can you do to currents in order to have a repulsive force of magnitude 4F?

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.