Which of the following is true about magnets?

Options

A. Every magnet has only two poles.
B. Different types of magnets have different number of poles.
C. Poles of the magnet can be isolated.
D. Both (a) and (c) are true.

Explanation

To determine which statement is true about magnets, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Properties of Magnets:**
- Every magnet has two poles: a North Pole and a South Pole. This is a fundamental property of magnets.

2. **Evaluating Option 1:**
- The statement claims that "every magnet has 2 poles."
- Since we know that every magnet indeed has a North Pole and a South Pole, this statement is **true**.

3. **Evaluating Option 2:**
- The statement says, "different types of magnets have different numbers of poles."
- We have established that all magnets, regardless of type, always have only two poles (North and South). Therefore, this statement is **false**.

4. **Evaluating Option 3:**
- The statement claims that "poles of a magnet can be isolated."
- This means that it suggests that you can have only a North Pole or only a South Pole existing independently. However, this is not possible as every magnet must have both poles. Thus, this statement is also **false**.

5. **Evaluating Option 4:**
- The statement claims that "both A and C are true."
- Since we have established that option A is true and option C is false, this statement is **false**.

6. **Conclusion:**
- After evaluating all options, the only true statement is from option 1: "every magnet has 2 poles."

### Final Answer:
The correct answer is **Option 1: Every magnet has 2 poles.**