English
Karnataka Board PUCPUC Science Class 11

The Electric Field and the Electric Potential at a Point Are E and V, Respectively.

Advertisements
Advertisements

Question

The electric field and the electric potential at a point are E and V, respectively.  

Options

  •  If E = 0, V must be zero. 

  •  If V = 0, E must be zero. 

  • If E ≠ 0, V cannot be zero. 

  • If V ≠0, E cannot be zero. 

  • None of the above.

MCQ
Advertisements

Solution

None of the above.

Electric field, \[E = \frac{- dV}{dr}\] where V = electric potential
For E = 0,  V should be constant. 
So, when E = 0,  it is not necessary that V should be 0.
Hence, none of the above signifies the correct relation.

 

shaalaa.com
  Is there an error in this question or solution?
Chapter 29: Electric Field and Potential - MCQ [Page 120]

APPEARS IN

HC Verma Concepts of Physics Volume 1 and 2 [English]
Chapter 29 Electric Field and Potential
MCQ | Q 3 | Page 120

RELATED QUESTIONS

An infinite line charge produces a field of 9 × 104 N/C at a distance of 2 cm. Calculate the linear charge density.


Consider a system of n charges q1, q2, ... qn with position vectors `vecr_1,vecr_2,vecr_3,...... vecr_n`relative to some origin 'O'. Deduce the expression for the net electric field`vec E` at a point P with position vector `vecr_p,`due to this system of charges.


A hollow cylindrical box of length 1 m and area of cross-section 25 cm2 is placed in a three dimensional coordinate system as shown in the figure. The electric field in the region is given by `vecE = 50xhati` where E is NC­−1 and x is in metres. Find

(i) Net flux through the cylinder.

(ii) Charge enclosed by the cylinder.


A hollow cylindrical box of length 0.5 m and area of cross-section 25 cm2 is placed in a three dimensional coordinate system as shown in the figure. The electric field in the region is given by `vecE = 20 xhati`  where E is NC­−1 and x is in metres. Find

(i) Net flux through the cylinder.

(ii) Charge enclosed by the cylinder.


The charge on a proton is +1.6 × 10−19 C and that on an electron is −1.6 × 10−19 C. Does it mean that the electron has 3.2 × 10−19 C less charge than the proton? 


If a body is charged by rubbing it, its weight


A point charge q is rotated along a circle in an electric field generated by another point charge Q. The work done by the electric field on the rotating charge in one complete revolution is 


A 10-cm long rod carries a charge of +50 μC distributed uniformly along its length. Find the magnitude of the electric field at a point 10 cm from both ends of the rod.


Consider a uniformly charged ring of radius R. Find the point on the axis where the electric field is maximum.

 

A particle of mass m and charge q is thrown at a speed u against a uniform electric field E. How much distance will it travel before coming to momentary rest ? 


A ball of mass 100 g and with a charge of 4.9 × 10−5 C is released from rest in a region where a horizontal electric field of 2.0 × 104 N C−1 exists. (a) Find the resultant force acting on the ball. (b) What will be the path of the ball? (c) Where will the ball be at the end of 2 s?


12 J of work has to be done against an existing electric field to take a charge of 0.01 C from A to B. How much is the potential difference  VB − VA


An electric field  \[\vec{E}  =  \vec{i}\]  Ax exists in space, where A = 10 V m−2. Take the potential at (10 m, 20 m) to be zero. Find the potential at the origin.


Electric lines of force about a negative point charge are ______.

Two identical blocks are kept on a frictionless horizontal table connected by a spring of stiffness k and of original length l0. A total charge Q is distributed on the block such that maximum elongation of spring at equilibrium is equal to x. Value of Q is ______.


Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region ______. 


In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason is ______.


The Electric field at a point is ______.

  1. always continuous.
  2. continuous if there is no charge at that point.
  3. discontinuous only if there is a negative charge at that point.
  4. discontinuous if there is a charge at that point.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×