i want to do problem 2 step by step please ? A current of 4 mA flows in a with c
ID: 1552162 • Letter: I
Question
i want to do problem 2 step by step please ?
A current of 4 mA flows in a with cross section area of 4 mm^2 (you must give the unit asked) What charge travels through the wire during 4000 seconds? a) 1000 b 16 c 16000 d) 4000 UNIT: ___ What is the number of electron associated to such a charge 21 a) 1 times 10^20 b) 1.5 times 10^22 c) 1 times 10^22 d) 6.3 times 10^21 What is the current density a) 1 times 10^3 b) 1 c) 1 times 10^-6 d) 1 times 10^-3 UNIT: ____ Consider the setup shown in Figure 2. The fields are taken to be constant with magnitude E = 1000 V/m and B = 0.01 T. The charge of the particle is q = -1 C.Explanation / Answer
Current = I =4mA = 4 x 10^-3 A
I=Q/t ; where Q = charge, t=time
in 4000 seconds chargq travelledthrough the wire ;
Q= It = 16 C
unit = coulomb
Charge on single electron = 1.6 x 10^-19 C
Number of electron associated to such charge = 16/1.6 x 10^-19 = 10^20
current density; J= I/A
where A is cross-sectional area
A= 4mm2 = 4 x 10^-6 m2
J= 4 x10^-3 A / 4 x 10^-6 m2 = 10^3 A/m2
unit = A/m2
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