8/19/2019 12 Physics Electrostatics Test 05 Answer 5bgj

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(

01. 1

  C A o

C d d 

∈=   ⇒   ∝  

, .

Q

V C 

=   .

.

02.

.

03. ms

υ     E 

 

.

∴  2

mv f 

r 

=  

=

2

2

  eE =

  =

mv

r 

e v

m Er 

⇒

 

04.  A o

C d 

∈=  

= /2 k   = ∞  

= =1 1(1 ) (1 )

2

o o

nef 

 A AC 

d d t    d k 

∈ ∈∴

− −   − −∞

  o2 A

  =2Cd 

∈=  

.

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05.21

2U CV =  

21

 

2

 A oU V 

d 

∈=  

= 10% == 0.9

21

'2 0.9

 A oU V 

d 

∈=  

= = 21 1

( 1)2 0.9

 AEoV 

d −  

0.1' ` ( )

90.9U U U U − = =  

% ==' 1 100%

  100 %= X 100%=9 9

U U  U U U 

−× ×  

% == 11.1%

06. () 2

101000

.1 10

d V  V  E mdr   x

υ 

−

= = =  

() 0V ∆ =  

∴  = .

()

if E=0

0 dv = 0 or V= constant (non zero).

dV  E 

dr 

dV 

dr 

−=

=   ⇒

 

07. ()

1

 V  r α  

 

Vp > Vp -- Vq -- PositiveVq ⇒ 

B A VA < V -- V -- Positive

 BV    ⇒

 

.

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Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

() 

.

()

.

08.

.

(1) .

(2)

.

 

1  2

. 1  2 

. 1 

2 

.

  1  ,

.

1.

. 2 

.

.

    , , α   

.