Aresistor and an inductor are connected in series to a battery with emf 240 v and negligible internal resistance. the circuit is completed at time t=0. at a later time t=t the current is 3.00 a and is increasing at a rate of 20.0 a/s. after a long time the current in the circuit is 25.0 a.

T = 0.141 s

Explanation:

given,

Battery emf = 240 V

Current after long time = 25 A

increasing rate of current = 20 A/s

time = ?

after long time

V = I R

R = 9.6 Ω

Voltage across inductor when I = 3 A

Voltage = 240 - 3 x 9.6

Voltage across inductor = 211.2 V

L = 10.56 H

time constant

now,

taking log both side

   T = 0.141 s

ice to water 1 water to vapour 2 latent heat

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 =