Question

A current of 10A is flowing from east to west in a long straight wire kept
on a horizontal table. The magnetic field developed at a distance of 10 cm
due north on the table is :
(a) 2 x 10-5 T, acting downwards (b) 2 x 10-5 T, acting upwards
(c) 4 x 10-5 T, acting downwards (d) 4 x 10-5 T, acting upwards
han . zavo undergoes reflection at an interface from rarer to denser​

Answer 1

Explanation:

Given A current of 10 A is flowing from east to west in a long straight wire kept  on a horizontal table. The magnetic field developed at a distance of 10 cm  due north on the table is :

• Here horizontal plane I = 10 A, r = 10 cm = 10 x 10^- 2 m
• Now for a straight wire towards north will be B = μo I / 2 π d
•                                                               = 4π x 10^-7 x 10 / 2 π x 10 x 10^-2
•                                                              So B = 2 x 10^- 5 T
• So the direction of the magnetic field will be acting downwards.

Reference link will be

https://brainly.in/question/15735750

Answer 2

The magnetic field developed at a distance of 10 cm  due north on the table is (a) 2 × 10⁻⁵ T, acting downwards.

Explanation:

The magnetic field at a point is given by the formula:

B = (μ₀I)/(2πd)

Where,

μ₀ = 4π x 10⁻⁷ H/m

I = 10 A

d = 10 cm = 10 × 10⁻² m

On substituting values, we get,

B = (4π x 10⁻⁷ × 10)/(2π × 10⁻¹)

∴ B = 2 × 10⁻⁵ T

Since, the current flows from east to west, then magnetic field flows downward.