Magnetism and Matter Physics - Magnetism and Matter

• ✓
  iron box
• B
  wooden box
• C
  metal box
• D
  none of these

Answer: A.

• ✓
  $\in_r=1.5 \quad \mu_r=0.5$
• B
  $\in_r=0.5 \quad \mu_r=0.5$
• C
  $\in_r=1.5 \quad \mu_r=1.5$
• D
  $\in_r=0.5 \quad \mu_r=1.5$

Answer: A.

• A
  $1.2 \times 10^{-4} T$
• ✓
  $2.4 \times 10^{-4} T$
• C
  $2.4 \times 10^{4} T$
• D
  $1.2 \times 10^{4} T$

Answer: B.

• A
  There is no force on its poles
• B
  Forces acting on their poles is parallel and their lines of action do not coincide.
• C
  Forces on their poles are perpendicular to each other
• ✓
  Forces on their poles are along the same line

Answer: D.

• A
  M
• ✓
  $\frac{2 M }{\pi}$
• C
  $\frac{ M }{\pi}$
• D
  $M \pi$

Answer: B.