A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is.

a) 0.090 mT. b) 0.36 mT. c) 23 mT. d) 36 mT. e) 45 mT.

option E

Explanation:

Given,

Length of the solenoid = 0.50 m

Number of turn = 1000 turn

radius, r = 4 cm

Current = 18 A

Magnetic field inside the solenoid.

Hence, the correct answer is option E

its c its is a mixture of gases

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =