Import Question JSON

Current Question (ID: 20466)

Question:

$\text{A bar magnet is demagnetized by inserting it inside a solenoid of length } 0.2 \text{ m, } 100 \text{ turns, and carrying a current of } 5.2 \text{ A. The coercivity of the bar magnet is:}$

Options:

1. $285 \text{ A/m}$
2. $2600 \text{ A/m}$
3. $520 \text{ A/m}$
4. $1200 \text{ A/m}$

Solution:

$\text{Hint: } B = \mu_0 H$ $N = 100$ $l = 0.2 \text{ m}$ $I = 5.2 \text{ A}$ $H = \frac{N \cdot I}{l} = \frac{100 \cdot 5.2}{0.2} = 2600 \text{ A/m}$

Import JSON File

Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}