Which of the following memories contains a thin film of magnetic material sandwitched between two permanent bias magnets?

ROM
Magnetic disk
Core memory
Bubble memory E. None of the above

The correct answer is C. Core memory.

Core memory is a type of computer memory that uses small ferrite rings to store data. The rings are arranged in a matrix, and each ring can be magnetized in one of two directions to represent a 0 or a 1. Core memory was the most common type of memory used in computers from the 1950s to the 1970s.

ROM (read-only memory) is a type of memory that can be read but not written to. ROM is used to store firmware, which is the software that controls the basic functions of a computer.

Magnetic disk is a type of storage device that uses a magnetic field to store data. Magnetic disks are commonly used to store data in computers and other electronic devices.

Bubble memory is a type of non-volatile memory that uses magnetic bubbles to store data. Bubble memory was once a promising technology for computer memory, but it was eventually replaced by other technologies such as flash memory.

E. None of the above is not the correct answer.

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