Magnetic Force

Answer (d)

Given that:
N = 20
gauss



Flux through the coil

The force per unit length between two parallel wires carrying currents in opposite directions is given by the formula: where is the permeability of free space, and are the currents in the wires, and is the distance between them. Since the currents are in opposite directions, the wires will repel each other. Thus, the correct answer is , and the wires repel each other.

Step 1: Understanding the Question:
Conventional electric current is defined as the flow of positive charge per unit time. We must calculate the individual current contributions from each type of charge carrier and find their vector sum.
Step 3: Detailed Explanation:
The rate of flow for each particle type is given as .
1. Electrons: These have a negative charge ( ). Moving to the left, they contribute to a conventional current directed towards the right.

2. Protons: These have a positive charge ( ). Moving to the left, they contribute to a conventional current directed towards the left.

3. -particles: These have a positive charge ( ). Moving to the right, they contribute to a conventional current directed towards the right.

Resultant Current Calculation:
Assigning "right" as the positive direction:


Step 4: Final Answer:
The resulting electric current is 3.2 A towards the right.