Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
In a cassette player materials used for coating magnetic tapes are (1) cobalt (2) \[NiF{{e}_{2}}{{O}_{4}}\] (3) nickel (4)\[CoF{{e}_{2}}{{O}_{4}}\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
Ferrites e.g.,\[CoF{{e}_{2}}{{O}_{4}}\]and\[NiF{{e}_{2}}{{O}_{4}}\]are used for coating magnetic tapes.
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