Choose the correct statements :-
(a) The tangent drawn at any point on the line of force gives the direction of the force acting on a positive charge at that point
(b) The normal drawn at any point on the line of force gives the direction of the force acting on a positive charge at that point
(c ) Electric lines of force start from a negative charge and end on a positive charge
(d) Electric lines of force start from a positive charge and end on a negative charge

Options

A. a, c
B. b, d
C. a, d
D. b, c

Answer

To solve the question, we need to analyze each statement regarding electric lines of force and the behavior of electric fields. Let's go through each statement step by step.

### Step 1: Analyze Statement (a)
**Statement (a):** The tangent drawn at any point on the line of force gives the direction of the force acting on a positive charge at that point.

- **Analysis:** The tangent to the electric field lines at any point gives the direction of the electric field, not the force. The force on a positive charge is in the direction of the electric field, but the statement is misleading as it implies a direct relationship with the force rather than the field.
- **Conclusion:** This statement is **incorrect**.

### Step 2: Analyze Statement (b)
**Statement (b):** The normal drawn at any point on the line of force gives the direction of the force acting on a positive charge at that point.

- **Analysis:** The normal to the electric field lines does not represent any physical quantity related to the force or electric field. The force on a positive charge is directed along the tangent to the electric field lines, not the normal.
- **Conclusion:** This statement is **incorrect**.

### Step 3: Analyze Statement (c)
**Statement (c):** Electric lines of force start from a negative charge and end on a positive charge.

- **Analysis:** This statement is incorrect. Electric field lines originate from positive charges and terminate on negative charges. The statement reverses this relationship.
- **Conclusion:** This statement is **incorrect**.

### Step 4: Analyze Statement (d)
**Statement (d):** Electric lines of force start from a positive charge and end on a negative charge.

- **Analysis:** This statement correctly describes the behavior of electric field lines. They indeed start from positive charges and end on negative charges.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
Based on the analysis:
- Statement (a) is incorrect.
- Statement (b) is incorrect.
- Statement (c) is incorrect.
- Statement (d) is correct.

Thus, the correct statements are **(d)**.

### Summary of Correct Statements:
- The correct option is **(d)**: Electric lines of force start from a positive charge and end on a negative charge.