A magnetic needle performs `20` oscillations per minute in a horizontal plane. If the angle of dip be `30^@`, then how many oscillation per minute will this needle perform in vertical, north south plane and in vertical east -west plane?
Text Solution
AI Generated Solution
To solve the problem, we need to determine the number of oscillations per minute of a magnetic needle in two different orientations: the vertical north-south plane and the vertical east-west plane, given that it performs 20 oscillations per minute in the horizontal plane with an angle of dip of \(30^\circ\).
### Step-by-Step Solution:
1. **Understand the Components of Earth's Magnetic Field**:
- The Earth's magnetic field can be resolved into two components:
- Horizontal component \( H \)
- Vertical component \( V \)
...
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