7/24/2019 Answer Scheme Test 1(Set 3)

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SET 3 PHY 131

PART A

1. B

2. D

3. C4. A

5. A

6. B7. A

8. C

9. D

10. D

PART B

No. Scheme Mark 1a) 1 2

2

q qF = k

r

A2

b)

q 1 = - 3 0 0

q 2 = 1 5 0

4 0 0 P

C

C

E q 1

E q 2 Eq1= A1

Eq2= A1

) 1q1 2

qE k

r=

=

9 6

2 2

8.99!10 !300!10

"2!10 )

= 6.74 ! 109#$C

2q2 2

qE kr

=

=

9 6

2 2

8.99!10 !150!10

"3!10 )

= 1.498 !109#$C

E!= Eq1!% Eq2!

A1

A1

DEPA&T'E#T (F APP*ED SC*E#CES

7/24/2019 Answer Scheme Test 1(Set 3)

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SET 3 PHY 131

= "-6.74 ! 109+, 40) "1.498 ! 10 9+, 40)

= -6.31 ! 109#$C

E= Eq1% Eq2 = "6.74 ! 109,/ 40) % "1.498 ! 109,/ 40)

= 5.295 ! 109

#$C

'a/ =2 2

! .E E+

= 9 2 9 2"6.31!10 ) "5.295!10 )+ = 8.24 ! 109#$C

D/r/+ = a-1.

!

E

E

= a

-1

9

9

5.295!10

6.31!10

= 40+" 2qara)

Ey &Ex= A1

F1

A1

A1

2. a) +rk + r / ar / +:/ a +,//: , ar /

;r/