Import Question JSON

Current Question (ID: 16966)

Question:

$\text{A metallic ring is attached to the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be:}$

Options:

1. $\text{first clockwise and then anticlockwise.}$
2. $\text{in the clockwise direction.}$
3. $\text{in the anticlockwise direction.}$
4. $\text{first anticlockwise and then clockwise.}$

Solution:

$\text{As it is seen from the magnet side induced current will be anticlockwise.}$ $\text{When the north pole of a magnet approaches the metallic ring, the magnetic flux through the ring increases.}$ $\text{According to Lenz's Law, the induced current will oppose this increase. The ring generates its own magnetic field with a north pole facing the approaching magnet.}$ $\text{Using the right-hand rule, this corresponds to an anticlockwise current when viewed from the side of the approaching magnet.}$ $\text{Hence, option (3) is the correct answer.}$

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
}