Question

Imagine rolling a sheet of paper into a cylinder and placing a bar magnet near its end as shown in figure. What can you say about the sign of $\vec{B}.d \vec{A}$ for every area $d \vec{A}$ on the surface?

• A. Positive
• B. Negative
• C. No sign
• D. Can be positive or negative

Answer 1

Answer: (B)

Negative

Answer 2

The field is entering into the surface so flux is negative.