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IIT JEE 2007 Practice : PHYSICS - Multiple Answers

Each question has one or more than one correct choices among (a), (b), (c) and (d). Write down all the correct choices in alphabetical order separated by one space each.
For example, if the correct choices are (a), (b) and (d) then simply type in the input box provided:
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iit_jee_practice_physics_multiple_answers_7a A small cubical block is held stationary against a rough wall by applying a force F at the center of the face opposite to the wall as shown. Then

(a) frictional force f is mg.
(b) normal force N by the wall is equal to F.
(c) normal force does not apply any torque on the block.
(d) force F does not apply any torque on the block.


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