Jac 12th Physics Previous year question 2006-2022 Chapter 1. Electric Charges and fields

Jac 12th physics previous years Questions chapter 1. Electric charges and fields पिछले वर्षो में जो भी प्रश्न पूछे गए हैं, उनकी चर्चा हम इसमें करेंगे इनमें हम सब्जेक्टिव प्रश्न तथा वस्तुनिष्ठ प्रश्न को देखेंगे तो इन महत्वपूर्ण प्रश्न को पढ़ लीजिए.

रांची: झारखंड एकेडमिक काउंसिल ( JAC Board) कक्षा 12 Physics chapter 1. Electric Charges and fields के पिछले वर्षों के सभी महत्वपूर्ण प्रश्न (important Questions) आपको यहाँ पर बताए जा रहे है, जो बोर्ड परीक्षा 2023 के लिए बहुत महत्वपूर्ण है, अगर आप इन सभी प्रश्नों को याद कर लेते हो तो अवश्य ही आप JAC बोर्ड class 12th physics exam में अच्छे अंक प्राप्त कर सकते हो.

विद्यार्थी इसका उत्तर स्वयं करें। ये सारे प्रश्न आपके परीक्षा में बार – बार पूछे जा रहे है। इसमें आपको सभी chapter का अलग-अलग पिछले 16 से 17 वर्षों के महत्वपूर्ण प्रश्न मिलेंगे। यानि 2006-2022 इसमें आपको ये भी बताया जा रहा है कि कौन से प्रश्न किस तरह से एवं कितने marks के पूछे  जा रहें है।

So students सबसे पहले हम Objective Question को देखेंगे फिर बाद में subjective question भी देखेंगे. यदि छात्र छात्राएं इन सभी प्रश्नों का उत्तर स्वयं से नहीं कर पाते हैं तो कुछ दिन तक wait कीजिए, आप यहां से इसका प्रश्न सहित उत्तर डाउनलोड कर सकते हैं.

इस बार परीक्षा में किस pattern पर आधारित रहेंगे?

इस बार आपके परीक्षा में 40 अंको की बहुवैकल्पिक प्रश्न रहेंगे तथा 40 अंको की subjective Questions रहेंगे, जिनमें लघु- उत्तरीय एवं दीर्घ – उत्तरीय प्रश्न रहेंगे और परीक्षा एक ही टर्म में होगी।

Objective Type Questions

Q1. The minimum value of charge of any charged body is – [JAC-2012]
a. 1.6 × 10^-19 Coulomb
b. 1 Coulomb
c. 1µC
d. 4.8 × 1012 Coulomb

Q2. A point charge Q is placed in an electric field E of magnitude the force experienced by the charge will be – [JAC-2013]
a. qE
b. q/E
c. E/q     
d. q²E²

Q3. The unit for permittivity of free space(e0) is – [JAC- 2014, 2016]
a. CN²/m²
b. C²/Nm²
c. CN/m        
d. C/Nm²

Q4. Torque acting on an electric dipole of moment (p) placed in a uniform electric field (e) is given by – [JAC – 2014]

a. pE       

b. p.E

c. p x E

d. E.p

Q5. Which of the following has unit volt/m?      [JAC-2015]

a. Electric flux     

b. Electric potential

c. Electric field   

d. electric capacity

Q6. The unit for electric intensity is  [JAC-2017]

a. N/m               

b. V/m

c. dyne/cm        

d. V/m²

Q7. An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by 90° is – [JAC-2017]

a. 2pE     

b. pE/2 

c. pE

d. 2pE

Q8. Two point charges +3µC and +4µC repel each other with a force of 10N. If each given an additional charge of 6µC , then the new force is – [JAC – 2019]

a. 2N      

b. 4N     

c. 5N      

d. 7.5N

Q9. A positively charged body has– [JAC- 2020]

a. Excess of electron

b. Deficit of electron

c. Excess of proton

d. Deficit of proton

Q10. Two charged spheres which are separated at a distance ‘d’ exert a force ‘F’ on each other. If charges are doubled and distance between them is doubled then the force is – [JAC-2022]

a. F       

b. F/2       

c. F/4       

d. 4F

Q11. If a charge on a body is 100nC, then how many electrons are present on the body? [JAC- 2022]

a. 6.25×10²⁷          

b. 1.6 × 10¹⁹

c. 6.25 × 10²⁸       

d. 6.25×10¹¹

Q12. Which one of the following is SI unit of electric field? [JAC- 2022]

a. Coulomb            

b. Newton

c. Volt/m                

d. N/C

Q13. When an electric dipole is placed uniform electric field it experience– [JAC-2022]

a. a net force

b. a torque

C. Both a net force and torque

d. Neither a net force nor a torque

Q14. A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled then they outward electric flux will– [JAC-2022]

a. Decrease to half

b. Increase two times

c. Remain unchanged

d. Increase four times

Q15. A Gaussian Surface encloses an electric dipole within it. The total flux across the sphere is-  [JAC- 2022 ]

a. half of that due to single charge

b. double that due to single charge.

c. dependent on the position of the dipole.

d. Zero

Q16. If Ea be the electric field strength of a short dipole at a point on its axial line and Ee that on the equatorial line at the same distance then- [JAC- 2022]

a. E_e=2E_a             

b. E_a=2E_e

c. E_a = E_e             

d. None of these

Subjective Questions

Q1. State Coulomb’s law for Electric Charge. [JAC-2006]

Q2. Applying Gauss’s theorem, derive an expression for electric charge at a point due to a point charge.[JAC-2006]

Q3. State and Explain Gauss’s theorem. [JAC-2007, 2011, 2014]

Q4. Two point charges of 5μC and 20 μC are separated by a distance of 25cm. Find the point on the line joining them at which electric field intensity is zero. [JAC-2007]

Q5. Derive an expression for electric field at any point due to a dipole. [JAC-2007]

Q6. What is the SI unit of absolute permittivity of free space. [JAC-2008]

Q7. State the law of conservation of electric charge. [JAC-2009]

Q8. Using Gauss’s law , determine the electric field at a point outside a charged spherical shell.
[JAC-2009, 2013]

Q9. State one basic property of electric charge. [JAC-2010]

Q10. State Coulomb’s of forces between two electric charges. [JAC-2010]

Q11. Give SI unit of Electric dipole moment . [JAC-2011]

Q12. State and explain the principle of quantization of charge . [JAC-2012, 2014, 2017]

Q13. Using Gauss’s law, show that no electric field intensity exists inside a hollow charged conductor.
[JAC-2012]

Q14. Write down the basic properties of electric charge . [JAC-2013]

Q15. Find the number of electrons present in charge(-6.4)nC. [JAC-2014]

Q16. What is electric flux? Give its unit. [JAC-2015]

Q17. Find a formula for torque acting on an electric dipole kept in a uniform electric field . Hence define electric dipole moment. [JAC-2015]

Q18. Define a electric field lines. Mention two of its properties. [JAC-2016]

Q19. State Gauss’s theorem in electrostatics. Use this theorem to derive expression for electric field due to a uniformly charged thin spherical shell at a point (i) outside and (ii) inside the shell. [JAC-2016, 2018]

Q20. Define electric dipole moment. Derive an expression for the electric field at a point on equiatorial (broad on side) position of an electric dipole . [JAC-2018]

Q21. State the principle of conservation and principle of quantization of charge. [JAC-2019]

Q22. What are electric field lines? Mention any two of its properties. (JAC-2020)
Q23. An infinite line charge produces and electric field of 1.8 × 10^5 N/C at distance of 2cm. calculate linear charger density.  (JAC -2020)

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