A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, then the magnitude of the frictional force acting on the block is

Options

A. 2.5 N
B. 0.98 N
C. 4.9 N
D. 0.49 N

Explanation

To solve the problem, we need to determine the magnitude of the frictional force acting on the block held against the wall. Let's break it down step by step.

### Step 1: Identify the forces acting on the block
The forces acting on the block are:
- The applied horizontal force (F) = 5 N (to the right)
- The weight of the block (W) = mg (downward)
- The normal force (N) exerted by the wall (perpendicular to the wall)
- The frictional force (f) acting upward (opposing the weight)
...