Calculate earth's magnetic field at a place where angle of dip `delta` is `60^(@)` and horizontal component of earth's magnetic field is 0.3 G

Explanation

To calculate the Earth's magnetic field (R) at a place where the angle of dip (δ) is 60 degrees and the horizontal component (H) is 0.3 G, we can use the relationship between the horizontal component, the vertical component, and the total magnetic field.

### Step-by-Step Solution:

1. **Understand the Relationship**: The total magnetic field (R) can be related to the horizontal component (H) and the angle of dip (δ) using the following formulas:
- Horizontal component: \( H = R \cos(δ) \)
- Vertical component: \( V = R \sin(δ) \)

...