At a place, the horizontal component of earth's magnetic field is B and angle of dip is `60^@`. What is the value of horizontal component of earth's magnetic field at equator?

Explanation

To solve the problem step by step, we will follow the reasoning laid out in the video transcript.

### Step 1: Understand the Given Information
We are given:
- The horizontal component of the Earth's magnetic field at a certain place is \( B \).
- The angle of dip (\( \delta \)) at that place is \( 60^\circ \).

### Step 2: Relate the Components of the Magnetic Field
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