Question and Answers Forum

ElectrostaticsQuestion and Answers: Page 3

Question Number 40804 Answers: 0 Comments: 6

Question Number 40786 Answers: 1 Comments: 0

A parallel plate capacitor of plate spacing, 1mm is charged to a potential of 50V.Find the energy density in the capacitor

$A p a r a l l e l p l a t e c a p a c i t o r o f p l a t e$ $s p a c i n g, 1 m m i s c h a r g e d t o a p o t e n t i a l$ $o f 50 V . F i n d t h e e n e r g y d e n s i t y i n$ $t h e c a p a c i t o r$

Question Number 40773 Answers: 1 Comments: 0

A pair of oppositely charged plane parallel plates each of area,100cm^2 has the electric field of the value 5.0×10^4 N/C.Calculate the charge on each plate.

$A p a i r o f o p p o s i t e l y c h a r g e d p l a n e$ $p a r a l l e l p l a t e s e a c h o f a r e a, 100 {c m}^{2}$ $h a s t h e e l e c t r i c f i e l d o f t h e v a l u e$ $5.0 \times 10^{4} N / C . C a l c u l a t e t h e c h a r g e$ $o n e a c h p l a t e .$

Question Number 40770 Answers: 1 Comments: 0

An electric dipole is placed at rest in a uniform external electric field,and released.Discuss its motion mathematically.

$A n e l e c t r i c d i p o l e i s p l a c e d a t r e s t$ $i n a u n i f o r m e x t e r n a l e l e c t r i c$ $f i e l d, a n d r e l e a s e d . D i s c u s s i t s$ $m o t i o n m a t h e m a t i c a l l y .$

Question Number 40740 Answers: 0 Comments: 5

Question Number 40711 Answers: 1 Comments: 0

Two point charges,q_1 =0.4μC and q_2 =−0.3μC are placed at 10cm apart.Calculate (a)the potential at point A which is midway between them,and (b)point B which is 6cm from q_1 and 8cm from q_2

$T w o p o i n t c h a r g e s, q_{1} = 0.4 μ C a n d$ $q_{2} = - 0.3 μ C a r e p l a c e d a t 10 c m$ $a p a r t . C a l c u l a t e$ $(a) t h e p o t e n t i a l a t p o i n t A w h i c h i s$ $m i d w a y b e t w e e n t h e m, a n d$ $(b) p o i n t B w h i c h i s 6 c m f r o m q_{1}$ $a n d 8 c m f r o m q_{2}$

Question Number 40700 Answers: 1 Comments: 0

A charge q_1 =2.0×10^(−9) C is placed at the point,(x=0,y=4cm) and another charge,q_2 =−3.0×10^(−9) C is located at the point,(x=3cm,y=4cm). If a third charge,q_3 =4.0×10^(−9) C is placed at the origin, a)obtain the x and y component of the total force on q_3 b)Calculate the magnitude and direction of the total force on q_(3.)

$A c h a r g e q_{1} = 2.0 \times 10^{- 9} C i s p l a c e d$ $a t t h e p o i n t, (x = 0, y = 4 c m) a n d$ $a n o t h e r c h a r g e, q_{2} = - 3.0 \times 10^{- 9} C$ $i s l o c a t e d a t t h e p o i n t, (x = 3 c m, y = 4 c m) .$ $I f a t h i r d c h a r g e, q_{3} = 4.0 \times 10^{- 9} C$ $i s p l a c e d a t t h e o r i g i n,$ $a) o b t a i n t h e x a n d y c o m p o n e n t o f$ $t h e t o t a l f o r c e o n q_{3}$ $b) C a l c u l a t e t h e m a g n i t u d e a n d$ $d i r e c t i o n o f t h e t o t a l f o r c e o n q_{3 .}$

Question Number 40699 Answers: 1 Comments: 0

Two point charges q_1 =1.5×10^(−9) C and q_2 =3.0×10^(−9) C are seperated by a distance of 200cm.Calculate the point at which the total electric field is zero.

$T w o p o i n t c h a r g e s q_{1} = 1.5 \times 10^{- 9} C$ $a n d q_{2} = 3.0 \times 10^{- 9} C a r e s e p e r a t e d$ $b y a d i s t a n c e o f 200 c m . C a l c u l a t e$ $t h e p o i n t a t w h i c h t h e t o t a l e l e c t r i c$ $f i e l d i s z e r o .$

Question Number 39794 Answers: 1 Comments: 0

Two charged concentric spheres have radii of 10cm and 18cm.The charge on the inner sphere is 6.0×10^(−8) C and that on the outer sphere is 2.0×10^(−8) C.Find the electric field (i)at r=12cm and (ii)at r=25cm

$T w o c h a r g e d c o n c e n t r i c s p h e r e s$ $h a v e r a d i i o f 10 c m a n d 18 c m . T h e$ $c h a r g e o n t h e i n n e r s p h e r e i s$ $6.0 \times 10^{- 8} C a n d t h a t o n t h e o u t e r$ $s p h e r e i s 2.0 \times 10^{- 8} C . F i n d t h e$ $e l e c t r i c f i e l d (i) a t r = 12 c m a n d$ $(i i) a t r = 25 c m$

Question Number 39792 Answers: 1 Comments: 1

A positive charge of magnigude 2.5μC is at the centre of an uncharged spherical conducting shell of inner radius 60cm and an outer radius of 90cm. (i)find the charge densities on thd inner and outer surfaces of the shell and the total charge on each surface. ii)find the electricity field everywhere.

$A p o s i t i v e c h a r g e o f m a g n i g u d e$ $2.5 μ C i s a t t h e c e n t r e o f a n u n c h a r g e d$ $s p h e r i c a l c o n d u c t i n g s h e l l o f i n n e r$ $r a d i u s 60 c m a n d a n o u t e r r a d i u s$ $o f 90 c m .$ $(i) f i n d t h e c h a r g e d e n s i t i e s o n t h d$ $i n n e r a n d o u t e r s u r f a c e s o f t h e$ $s h e l l a n d t h e t o t a l c h a r g e o n e a c h$ $s u r f a c e .$ $i i) f i n d t h e e l e c t r i c i t y f i e l d$ $e v e r y w h e r e .$

Question Number 39623 Answers: 0 Comments: 0

Two equal charges q_1 =q_(2 ) =−6μC are on the y−axis at y_1 =3cm and y_2 =−3cm. i)What is the magnitude and direction of the electric field on the x−axis at x= 4cm, ii)if a test charge q_0 =2μC is plqced at x=4cm,find the force the net charge experiences.

$T w o e q u a l c h a r g e s q_{1} = q_{2} = - 6 μ C$ $a r e o n t h e y - a x i s a t y_{1} = 3 c m a n d$ $y_{2} = - 3 c m .$ $i) W h a t i s t h e m a g n i t u d e a n d$ $d i r e c t i o n o f t h e e l e c t r i c f i e l d o n t h e$ $x - a x i s a t x = 4 c m,$ $i i) i f a t e s t c h a r g e q_{0} = 2 μ C i s p l q c e d$ $a t x = 4 c m, f i n d t h e f o r c e t h e n e t$ $c h a r g e e x p e r i e n c e s .$

Question Number 39622 Answers: 0 Comments: 0

Two charges Q_0 and 3Q_0 are at l distance apart.These two charges are free to move but do not because is a third charge nearby.What must be the charge for the first two to be in equilibrium?

$T w o c h a r g e s Q_{0} a n d 3 Q_{0} a r e a t l$ $d i s t a n c e a p a r t . T h e s e t w o c h a r g e s$ $a r e f r e e t o m o v e b u t d o n o t b e c a u s e$ $i s a t h i r d c h a r g e n e a r b y . W h a t m u s t$ $b e t h e c h a r g e f o r t h e f i r s t t w o t o b e$ $i n e q u i l i b r i u m ?$

Question Number 39573 Answers: 1 Comments: 1

Point charges 88μC,−55μC and 70μC are placed in a straight line. The central one is 0.75m from each of the others.Calculate the net force on each due to the other two.

$P o i n t c h a r g e s 88 μ C, - 55 μ C a n d$ $70 μ C a r e p l a c e d i n a s t r a i g h t l i n e .$ $T h e c e n t r a l o n e i s 0.75 m f r o m$ $e a c h o f t h e o t h e r s . C a l c u l a t e t h e$ $n e t f o r c e o n e a c h d u e t o t h e o t h e r$ $t w o .$