Question

Magnetism at the centre of a bar magnet is:

• A. Minimum
• B. Maximum
• C. Zero
• D. Minimum or maximum

Hint:

Think about where the pull of the north pole and the pull of the south pole exactly balance out.

Answer 1

The Correct Option is C

Step 1: Locate the poles.
In a bar magnet the north pole and the south pole lie close to the two ends, not exactly at the ends and not at the middle.
Step 2: Look at the exact centre.
The centre point of the magnet lies exactly midway between the north pole and the south pole, so it is equally far from both poles.
Step 3: Add up the effects.
The magnetic effect due to the north pole at this centre point is equal in strength to the magnetic effect due to the south pole, but the two effects point in opposite directions, so they cancel each other completely.
Step 4: Rule out the other options.
The magnetism is strongest near the poles, so option B, maximum, is wrong. Since the two effects cancel exactly, the value is not just small, it is zero, so option A, minimum, is not precise, and option D is vague and incorrect.
Final Answer: C) Zero.