Hello candidate,

The value of magnetic flux density (©) is given as and the formula is equal to magnetic field at a point multiplied by its area (B*A).

The value of Magnetic field (B) is equal to 10^-7 * q/r. The value of area is equal to π× r^2. The value of B* A equals to 10^-7 * π×q× r. So, the value is= 10^-8π* q. So, the value of q equals to {0.2* 10^3/ 10^-8×π}= 0.06* 10^11 Amperes.

Hope this answer helps you.