A long vertical wire carrying a current of 10A in the upward direction is placed in a region where a horizontal magnetic field of magnitude(`2.0 xx 10^-3)` T exists from south to north. Find the point where the resultant magnetic field is zero.

Explanation

To solve the problem of finding the point where the resultant magnetic field is zero due to a long vertical wire carrying a current and an external magnetic field, we can follow these steps:

### Step 1: Understand the Magnetic Fields
We have two magnetic fields to consider:
1. The magnetic field due to the long vertical wire (B1).
2. The external horizontal magnetic field (B2) directed from south to north.

### Step 2: Determine the Direction of Magnetic Fields
...