The magnetic force on a charged particle is given as: F = qvBsinФ

B is the magnetic field.

q is the charge on the particle.

v is the velocity of the charged particle.

Ф is the angle between magnetic field (B) & the velocity of charge (v).

⇒ F = qvb sin Ф

Here, Ф = 90 degree.

and sin 90 = 1

Putting the values in the equation, we get,

F = 1.6 x 10^-19 C × 4.5 × 10^7 m/s × 1.6 T

= 11.52 × 10^-12N

= 1.2 x 10^-11 N up

**Answer:**

<em>**7.2 N**</em>

**Explanation:**

length of wire L = 240 m

current I = 500 A

field strength B = 3 x 10^-5 T

magnetic force on a current carrying conductor F is given as

F = BILsin∅

The wires are perpendicular with field therefore sin∅ = sin 90° = 1

therefore,

F = BIL = 3 x 10^-5 X 500 X 240 = 3.6 N

<em>**If the wire exists between this two transmission lines, then total magnetic force on the wire = 2 x 3.6 = 7.2 N**</em>

Gravity - is the universal force that is effective over the longest distance.

**Answer:**

An atmosphere is the layers of gases surrounding a planet or other celestial body. Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and one percent other gases

**Answer:**

**Worldwide Radio Communication**

**Explanation:**

The ionosphere is important because it is through the ionosphere that world wide radio communication is possible.