need step by step solution on question 2 where #N = 1418 1, (15)Two pont charges

Question

need step by step solution on question 2 where #N = 1418

1, (15)Two pont charges of q=0.5 (#N) C and Q= 2 (#N) pC are placed at x-0 and x-1.2 m. At what point x along the line connecting the two charges is the total electric field due to the two charges equal tzero? a)39.9cm b)0.621m c)822mm d)0.491 m e) None of these is true 2(15) A certain material with resistance Ro_(#N) is in a room at T-80.7 If the absolute temperature T K of the material is doubled, its resistance also doubles. What is the value for "(1/°C)? a)0.011 b)0.0022 0.034 "F d)0.0033 e)None of this is true

Explanation / Answer

2.15

Given,

R0 = 1418 Ohm ;

T0 = 80.7 F = 27.06 deg C

Tf = 2 x 27.06 = 54.12 deg C

R = 2R = 2 x 1418 = 2836 Ohm

We know that

R = R0 [1 + alpha(T2 - T1)]

2836 = 1418 [ 1 + alpha(54.12 - 27.06)]

1 + 27.06 alpha = 2

alpha = (2 - 1)/27.06 = 0.034

Hence, (c)alpha = 0.034 per deg C

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