Testbook Logo
Exams SuperCoaching Test Series Skill Academy
More
English
Hindi

Question

Download Solution PDF

An electric dipole is placed in a uniform electric field. The net electric force on the dipole

  1. Always zero
  2. Always - ve
  3. Depends on the orientation of the dipole
  4. None of these

Answer (Detailed Solution Below)

Option 1 : Always zero
Free Tests
View all Free tests >
Free
Agniveer Navy SSR Full Test - 01
4.1 K Users
100 Questions 100 Marks 60 Mins
Start Now

Detailed Solution

Download Solution PDF

CONCEPT:

  • An electric dipole is a system of two equal and opposite charges separated by a fixed distance and the strength of a dipole is measured by dipole moment. It is calculated as P = q x 2a

F1 P.Y Madhu 9.03.20 D7

EXPLANATION

  • When a dipole is placed in an electric field each charge experiences a force that is equal to F = qE.
  • Force on a negative charge is F-q = -qE and its direction are in the opposite of direction of the electric field.
  • Force on positive charge q is Fq = qE and its direction is in the direction of the electric field.
  • The net force on the dipole is F = F-q+ Fq = -qE + qE = 0
  • So, the correct answer will be option 1.

Important Points 

  • When the dipole is placed in a uniform electric field, the net force on the dipole is zero.
  • When the dipole is placed in a non-uniform electric field, it experiences both forces as well as torque.
Download Solution PDF
Latest Indian Navy Agniveer SSR Updates

Last updated on May 31, 2025

-> The Indian Navy SSR Agniveeer Merit List will be released soon on the official website.

-> The Indian Navy Agniveer SSR CBT Exam was conducted from 25th to 26th May 2025.

->The application window was open from 29th March 2025 to 16th April 2025.  

-> The Indian Navy SSR Agniveer Application Link is active on the official website of the Indian Navy.

.->Only unmarried males and females can apply for Indian Navy SSR Recruitment 2025.

-> The selection process includes a Computer Based Test, Written Exam, Physical Fitness Test (PFT), and  Medical Examination.

->Candidates Qualified in 10+2 with Mathematics & Physics from a recognized Board with a minimum 50% marks in aggregate can apply for the vacancy.

-> With a salary of Rs. 30,000, it is a golden opportunity for defence job seekers.

-> Candidates must go through the Indian Navy SSR Agniveer Previous Year Papers and Agniveer Navy SSR mock tests to practice a variety of questions for the exam.

More Electric Dipole Questions

Q1.An electric dipole of moment ‘p’ placed in a uniform electric field E has minimum (negative) potential energy when the angle between ‘p’ and E is _________.
Q2.The −ve and +ve charges of a dipole of moment \(\rm\overrightarrow{p}\) are placed at points −îa and +îa. The electric field intensity due to the dipole at the point located at ĵy in air where y >> a is:
Q3.A sphere encloses an electric dipole with charges ±3 × 10−6 C. What is the total electric flux across the sphere ?
Q4.A short electric dipole has a dipole moment of 16 × 10−9 Cm. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the dipole axis is : \(\left(\frac{1}{4 \pi \epsilon_{0}} = 9 \times 10^{9} \text{Nm}^{2}/\text{C}^{2}\right)\)
Q5.A dipole is placed in an electric field as shown. In which direction will it move ? 
Q6.What will be the electric field intensity at the point P due to a short dipole if the dipole is placed in air or vaccum?
Q7.An electric dipole is placed such that the positive charge is placed towards the west of the negative charge, then the direction of the electric field at any point on the equatorial line of the dipole will be:
Q8.A circular ring carrying a uniformly distributed charge Q and a point charge -Q on the axis of the ring is shown in figure. The magnitude of the dipole moment of the charge system is
Q9.Dipole field is _________.
Q10.Which of the following is a vector quantity?

More Electric Fields and Gauss' Law Questions

Q1.If the magnetic field in a plane electromagnetic wave is given by \(\rm \vec{B}\) = 3 × 10−8 sin(1.6 × 103x + 48 × 1010 t)ĵ T then what will be expression for electric field?
Q2.Two infinite planes each with uniform surface charge density +σ C/m2 are kept in such a way that the angle between them is 30o. The electric field in the region shown between them is given by:
Q3.An infinitely long positively charged straight thread has a linear charge density λ Cm–1. An electron revolves along a circular path having axis along the length of the wire. The graph that correctly represents the variation of the kinetic energy of electron as a function of radius of circular path from the wire is :
Q4.Choose the wrong statement about Electric flux ?
Q5.One electron volt is equal to :
Q6.The surface charge density of a thin spherical shell placed in an air medium is 88.54 c/m2 The intensity of the electric field measured 12 mm outside the shell from the centre of the shell is 5.625 × 1012 N/C. The thin spherical shell has a radius of: 
Q7.Which of the following statements is/are correct? (i) Gauss' law applies to any closed surface, regardless of shape or size. (ii) We cannot distinguish between positive and negative flux depending on the direction of the electric flux lines. (iii) The net electric flux leaving a surface will always be zero if there is a charge bound inside of it. 
Q8.In a vacuum, two point charges with magnitudes of +1.8 nC and -1.8 nC are separated by 6 mm along the x-axis. At the halfway point of the separation distance, the electric field is _____.
Q9.The electric flux passing through a surface of area A = 8j m2 in an electric field vector E = 2i + 3j - 4k V/m (bold is for vectors) is:
Q10.Given below are two statements : Statement I: The electric field produced by a scalar source is known as electric charge. Statement II: The magnetic field produced by a vector source is known as current element (I dl). In the light of the above statements, choose the correct answer from the options given below:
Suggested Exams
Exam-Logo
Indian Navy Agniveer SSR

Indian Navy Agniveer SSR Important Links

More Physics Questions

Q1. A bar magnet has total length 2l = 20 units and the field point P is at a distance d = 10 units from the centre of the magnet. If the relative uncertainty of length measurement is 1%, then uncertainty of the magnetic field at point P is : 
Q2.A bi-convex lens is constructed using two thin plano-convex lenses, as shown in the figure. The refractive index of the first lens is 1.5, and that of the second lens is 1.2. Both curved surfaces have the same radius of curvature, R = 14 cm. For this bi-convex lens, when the object distance is 40 cm, determine the image distance:
Q3.In a closed system of two interacting particles, m1 and m2, the center of mass is stationary. Given the trajectory of m1 and that m2 = m1, determine the trajectory of m2.
Q4.Match the following entries in column-I and column-II with respect to an oscillating spring-block system: Column-I Column-II (a) Mass of the block is doubled (i) Energy of oscillation becomes 4 times (b) Spring constant is made 4 times (ii) Speed of block becomes 2 times (c) Amplitude of oscillations is doubled (iii) P.E. becomes 4 times (d) Angular frequency is doubled (iv) Time period becomes √2 times (e) length of spring is quadrupled (v) Time period becomes 2 times
Q5.Consider the process of one mole of monatomic ideal gas shown in the T-V diagram. The correct match is based on the following equations and principles: Column - 1 Column - 2 (I) Work done in the isothermal process (1 → 2) (i) (RT0 / 3) ln 2 (II) Change in internal energy (1 → 2 → 3) (ii)RT0 (III) Total heat absorbed (1 → 2 → 3) (iii)  (RT0 / 3) [3 + ln 2] (IV) Heat absorbed in the isothermal process (1 → 2) (iv)  (RT0 / 5) ln 2 (V) Work done in the process (1 → 2→ 3) (v) RT0 /2  
Q6.For the LCR AC circuit (resonance frequency ωo) shown in the figure below, choose the correct statement(s). List 1 List 2 (i) ω0 a) depends on L,C (ii) At ω =ω0 , VR is   b) independent of L, C (iii) VR and I are  c) In phase (iv)  At ω =ω0 /2, VR is   d) Out of phase  
Q7.Match the Following: Match the entries from Column-1 with their corresponding descriptions in Column-2 and numerical values in Column-3. Column - 1 Column - 2 Column - 3 (I) Planck’s radiation law (i) Peak wavelength shifts inversely with temperature (P) 0.5 (II) Stefan-Boltzmann law (ii) Energy radiated is proportional to the fourth power of temperature (Q) 0.25 (III) Kirchhoff’s Law of Radiation (iii) Absorptivity equals emissivity in thermal equilibrium (R) 0.3 (IV) Newton’s Cooling Law (iv) Rate of cooling is proportional to the temperature difference (S) 0.4   A surface reflects 70% of the incident energy. Determine the most appropriate match for its emissivity.  
Q8.A ball of 8 kg, moving at 15 m/s, enters a 22 kg spring gun at rest. If the surfaces are frictionless and the spring is massless, determine the gun's speed after the ball stops moving relative to the gun.
Q9.A square frame is constructed from four uniform rods. The rods, AB, BC, CD, and DA, have masses 2m, 3m, 4m, and 5m respectively, and each has a length of 2a.  Where is the center of mass of this frame located in the x-y plane, specifically, which quadrant or region defined by x and y coordinates.
Q10.Imagine you have a cup of Starbucks coffee in a moving car. If the car suddenly brakes
Important Exams
Super Coaching
Exams
Test Series
Previous Year Paper
Objective Question
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
[email protected]
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Our Apps
Follow us on
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Get Free Access Now
Hot Links： teen patti real cash 2024 teen patti gold real cash teen patti party teen patti rules teen patti go