A) 570 V 8) 21 v C) 41 V D) 18 V E) 100 V 2 If the digmeter A) 66 Ohms 8) 33 Ohm

Question

A) 570 V 8) 21 v C) 41 V D) 18 V E) 100 V 2 If the digmeter A) 66 Ohms 8) 33 Ohms C) 300 Ohms D) 100 Ohms E) None of these are true 9y A) The current at A is equal to the current at B, which is u to the current at C, which is equal to the current at b B) The current at A is greater thon the current at B, which is equal to the current at C, which is greater than the current ot g C) The current at A is greater thon the current at 8, which is greater than the current at D A) current 8) electric field inside Q

Explanation / Answer

2.

Resistance is given by:

R = rho*L/A

If wire's material is same, then

R2/R1 = (L2/L1)*(A1/A2)

Give that R1 = 100 ohm

L2 = 2*L1

A2 = 3*A1

Then

R2 = R1*(L2/L1)*(A1/A2)

R2 = 100*(2/1)*(1/3) = 66.67 ohm

Correct option is A

3.

1/Req = 1/R1 + 1/R2 + /1R3

Req = (1/10 + 1/12 + 1/4)^-1 = 2.31 ohm

V = ieq*Req = 1*2.31 = 2.31 V

Now since parallel circuit so voltage in each of them will be equal to total voltage

i = V/R

Since current is inversely proportional to R, So wire with minimum resistance will give max current

i = 2.31/4 = 0.58 Amp

Correct option is D.

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