A horizontal force \( F \) is applied such that the block remains stationary then which of the f...

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A horizontal force \( F \) is applied such that the block remains stationary then which of the following statement is false
[IIT JEE 2005]
(a) \( f=m g \) [where \( f \) is the friction force]
(b) \( F=N \) [where \( N \) is the normal force]
(c) F will not produce torque
(d) N will not produce torque
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