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Alnico, an alloy used extensively for per-manent magnets contains iron, nickel, aluminium and cobalt in the following ratio | |
A. | 50 : 20 : 20 : 10 [Correct Answer] |
B. | 40 : 30 : 20 : 10 [Wrong Answer] |
C. | 50 : 20 : 10 : 20 [Wrong Answer] |
D. | 30 : 20 : 30 : 20 [Wrong Answer] |
E. | 50 : 10 : 20 : 20. [Wrong Answer] |