Physics Past Paper PDF - Electric Charges 20XX

1. The electric charge can be created or destroyed ‫ﻣﻦ اﻟﻤﻤﻜﻦ ﺗﻮﻟﯿﺪ او اﺗﻼف اﻟﺸﺤﻨﺎت اﻟﻜﮭﺮﺑﯿﺔ‬ (i) True (ii) False 2. The value of the electric charge must be equal to multiples of electron's charge ‫ﯾﺠﺐ أن ﺗﻜﻮن ﻗﯿﻤﺔ اﻟﺸﺤﻨﺔ اﻟﻜﮭﺮﺑﯿﺔ ﻣﺴﺎوﯾﺔ...

1. The electric charge can be created or destroyed ‫ﻣﻦ اﻟﻤﻤﻜﻦ ﺗﻮﻟﯿﺪ او اﺗﻼف اﻟﺸﺤﻨﺎت اﻟﻜﮭﺮﺑﯿﺔ‬ (i) True (ii) False 2. The value of the electric charge must be equal to multiples of electron's charge ‫ﯾﺠﺐ أن ﺗﻜﻮن ﻗﯿﻤﺔ اﻟﺸﺤﻨﺔ اﻟﻜﮭﺮﺑﯿﺔ ﻣﺴﺎوﯾﺔ ﻟﻤﻀﺎﻋﻔﺎت ﺷﺤﻨﺔ اﻹﻟﻜﺘﺮون‬ (i) True (ii) False 3. Charging by induction can be done without physical contact ‫ﯾﻤﻜﻦ أن ﯾﺘﻢ اﻟﺸﺤﻦ ﻋﻦ طﺮﯾﻖ اﻟﺤﺚ دون اﺗﺼﺎل ﻣﺎدي‬ (i) True (ii) False 4. Charging by polarization can be done without physical contact ‫ﯾﻤﻜﻦ أن ﯾﺘﻢ اﻟﺸﺤﻦ ﻋﻦ طﺮﯾﻖ اﻻﺳﺘﻘﻄﺎب دون اﺗﺼﺎل ﻣﺎدي‬ (i) True (ii) False 5. Charging by friction can be done without physical contact ‫ﯾﻤﻜﻦ أن ﯾﺘﻢ اﻟﺸﺤﻦ ﻋﻦ طﺮﯾﻖ اﻻﺣﺘﻜﺎك دون اﺗﺼﺎل ﻣﺎدي‬ (i) True (ii) False 6. Charging by polarization can be done in metals ‫ﯾﻤﻜﻦ ان ﯾﺘﻢ اﻟﺸﺤﻦ ﻋﻦ طﺮﯾﻖ اﻻﺳﺘﻘﻄﺎب ﻓﻲ اﻟﻤﻌﺎدن‬ (i) True (ii) False 7. Charging by induction can be done in metals  ‫ﯾﻤﻜﻦ ان ﯾﺘﻢ اﻟﺸﺤﻦ ﻋﻦ طﺮﯾﻖ اﻟﺤﺚ ﻓﻲ اﻟﻤﻌﺎدن‬ (i) True (ii) False 8. Let the force between two similar electric charges q1 and q2 separated by distance r be F. If the distance between q1 and q2 is doubled, the force will be. ‫ اذا ﺗﺘﻀﺎﻋﻔﺖ اﻟﻤﺴﺎﻓﺔ ﺑﯿﻦ‬.(F) ‫( ﺗﺴﺎوي‬r) ‫( ﺑﯿﻨﮭﻤﺎ ﻣﺴﺎﻓﺔ‬q2‫ و‬q1) ‫ﺑﻔﺮض ان اﻟﻘﻮة ﺑﯿﻦ ﺷﺤﻨﺘﺎن ﻣﺘﺸﺎﺑﮭﺘﺎن‬ ‫اﻟﺸﺤﻨﺘﺎن ﻓﺄن اﻟﻘﻮة‬ (i) F, (ii) F/2, (iii) F/4, (iv) 2 F. 9. Let the force between two similar electric charges q1 and q2 separated by distance r be F. If q1 is doubled and q2 is doubled, the force will be. ‫ اذا ﺗﺘﻀﺎﻋﻔﺖ اﻟﺸﺤﻨﺔ اﻻوﻟﻲ‬.(F) ‫( ﺗﺴﺎوي‬r) ‫( ﺑﯿﻨﮭﻤﺎ ﻣﺴﺎﻓﺔ‬q2‫ و‬q1) ‫ﺑﻔﺮض ان اﻟﻘﻮة ﺑﯿﻦ ﺷﺤﻨﺘﺎن ﻣﺘﺸﺎﺑﮭﺘﺎن‬ ‫( ﻓﺄن اﻟﻘﻮة‬q2) ‫( وﺗﺘﻀﺎﻋﻔﺖ اﻟﺸﺤﻨﺔ اﻟﺜﺎﻧﯿﺔ‬q1) (i) F, (ii) 2 F, (iii) F/4, (iv) 4F. 10. Let the force between two similar electric charges q1 and q2 separated by distance r be F. If the distance r is doubled, q1 is doubled, and q2 is double, the force will be: ‫ اذا ﺗﺘﻀﺎﻋﻔﺖ اﻟﻤﺴﺎﻓﺔ ﺑﯿﻦ‬.(F) ‫( ﺗﺴﺎوي‬r) ‫( ﺑﯿﻨﮭﻤﺎ ﻣﺴﺎﻓﺔ‬q2‫ و‬q1) ‫ﺑﻔﺮض ان اﻟﻘﻮة ﺑﯿﻦ ﺷﺤﻨﺘﺎن ﻣﺘﺸﺎﺑﮭﺘﺎن‬ ‫( ﻓﺄن اﻟﻘﻮة‬q2) ‫( وﺗﺘﻀﺎﻋﻔﺖ اﻟﺸﺤﻨﺔ اﻟﺜﺎﻧﯿﺔ‬q1) ‫اﻟﺸﺤﻨﺘﺎن و ﺗﺘﻀﺎﻋﻔﺖ اﻟﺸﺤﻨﺔ اﻻوﻟﻲ‬ (i) F, (ii) F/2, (iii) F/4, (iv) F/8. 11. Let the force between two similar electric charges q1 and q2 separated by distance r, be F. If the distance r is reduced to r/2, q1 is doubled, and q2 is doubled, the force will be: ‫ اذا ﺗﻨﺎﻗﺼﺖ اﻟﻤﺴﺎﻓﺔ‬.(F) ‫( ﺗﺴﺎوي‬r) ‫( ﺑﯿﻨﮭﻤﺎ ﻣﺴﺎﻓﺔ‬q2‫ و‬q1) ‫ﺑﻔﺮض ان اﻟﻘﻮة ﺑﯿﻦ ﺷﺤﻨﺘﺎن ﻣﺘﺸﺎﺑﮭﺘﺎن‬ ‫( ﻓﺄن اﻟﻘﻮة‬q2) ‫( وﺗﺘﻀﺎﻋﻔﺖ اﻟﺸﺤﻨﺔ اﻟﺜﺎﻧﯿﺔ‬q1) ‫( و ﺗﺘﻀﺎﻋﻔﺖ اﻟﺸﺤﻨﺔ اﻻوﻟﻲ‬r/2) ‫ﺑﯿﻦ اﻟﺸﺤﻨﺘﺎن اﻟﻲ‬ (i) F, (ii) 4F, (iii) 8F, (iv) 16F.  12. The electric force (or Coulomb force): (‫اﻟﻘﻮة اﻟﻜﮭﺮﺑﯿﺔ )او ﻗﻮة ﻛﻮﻟﻮم‬ (i) is always attractive, ‫داﺋﻤﺎ ﺗﻜﻮن ﺗﺠﺎذب‬ (ii) is always repulsive, ‫داﺋﻤﺎ ﺗﻜﻮن ﺗﻨﺎﻓﺮ‬ (iii) can be either attractive or repulsive. ‫ﻣﻦ اﻟﻤﻤﻜﻦ ان ﺗﻜﻮن ﺗﺠﺎذب او ﺗﻨﺎﻓﺮ‬ 13. Find the force between 2C and -1C separated by a distance 1m in air ‫ﻣﺘﺮ ﻓﻲ اﻟﮭﻮاء‬۱ ‫ﻛﻮﻟﻮم ﻣﻔﺼﻮﻟﺔ ﺑﻤﺴﺎﻓﺔ‬۱- ‫ﻛﻮﻟﻮم و‬۲ ‫أوﺟﺪ اﻟﻘﻮة ﺑﯿﻦ ﺷﺤﻨﺔ‬ i) 18 X 109 N ii) -18 X 109 N iii) 18 X 10-9 N iv) -18 X 10-9 N 14. A charge of 2x10-7 C is acted upon by a force of 0.1N. Determine the distance to the other charge of 4.5 X 10-7 C, both the charges are in vacuum. ٤٫٥ ‫ ﺣﺪد اﻟﻤﺴﺎﻓﺔ إﻟﻰ اﻟﺸﺤﻨﺔ اﻷﺧﺮى ﺑﻤﻘﺪار‬.‫ ﻧﯿﻮﺗﻦ‬۰٫۱ ‫ ﻛﻮﻟﻮم ﻣﺆﺛﺮة ﺑﻘﻮة ﻣﻘﺪارھﺎ‬۷-۱۰ × ۲ ‫ﺷﺤﻨﺔ ﻣﻘﺪارھﺎ‬.‫ وﻛﻼ اﻟﺸﺤﻨﺘﯿﻦ ﻓﻲ ﻓﺮاغ‬،‫ ﻛﻮﻟﻮم‬۷-۱۰ × i) 0.03 ii) 0.05 iii) 0.07 iv) 0.09 15. Three charged particles are located at the corners of an equilateral triangle as shown in figure. Calculate the total electric force on the 7 µC charge. ‫ﺗﻮﺟﺪ ﺛﻼث ﺟﺴﯿﻤﺎت ﻣﺸﺤﻮﻧﺔ ﻓﻲ زواﯾﺎ ﻣﺜﻠﺚ ﻣﺘﺴﺎوي اﻷﺿﻼع ﻛﻤﺎ ھﻮ ﻣﻮﺿﺢ‬.‫ﻣﯿﻜﺮوﻛﻮﻟﻮم‬۷ ‫ اﺣﺴﺐ إﺟﻤﺎﻟﻲ اﻟﻘﻮة اﻟﻜﮭﺮﺑﺎﺋﯿﺔ اﻟﻤﺆﺛﺮة ﻋﻠﻰ ﺷﺤﻨﺔ‬.‫ﻓﻲ اﻟﺸﻜﻞ‬ i). 0.504 N ii) 1.008 N iii) 0.872 N iv) 1.512 N 16. The electric dipole moment of an electric dipole is: ‫ﻋﺰم اﻟﻤﺰدوج اﻟﻘﻄﺒﻲ ﯾﻜﻮن‬ Scalar quantity, ‫ﻛﻤﯿﺔ ﻗﯿﺎﺳﯿﺔ‬ vector quantity, ‫ﻛﻤﯿﺔ ﻣﺘﺠﮭﺔ‬ directed from +q to –q, ‫ﯾﺘﺠﮫ ﻣﻦ اﻟﺸﺤﻨﺔ اﻟﻤﻮﺟﺒﺔ اﻟﻲ اﻟﺸﺤﻨﺔ اﻟﺴﺎﻟﺒﺔ‬ directed from –q to +q. ‫ﯾﺘﺠﮫ ﻣﻦ اﻟﺸﺤﻨﺔ اﻟﺴﺎﻟﺒﺔ اﻟﻲ اﻟﺸﺤﻨﺔ اﻟﻤﻮﺟﺒﺔ‬ 17. A water molecule (H2O) has an electric dipole moment of 6.2 x 10-30 C m. (note: it has 10 electrons and 10 protons) ‫ اﻟﻜﺘﺮوﻧﺎت‬۱۰ ‫ )ﺟﺰئ اﻟﻤﺎء ﯾﺤﺘﻮي ﻋﻠﻲ‬.‫ ﻛﻮﻟﻮم ﻣﺘﺮ‬۳۰-۱۰ × ٦،۲ ‫ﺟﺰئ ﻣﺎء ﻟﮫ ﻋﺰم اﻟﻤﺰدوج اﻟﻘﻄﺒﻲ ﯾﺴﺎوي‬ (‫ ﺑﺮوﺗﻮﻧﺎت‬۱۰ ‫و‬ - How far apart the effective centers of positive and negative charges in this molecule? ‫ إﻟﻰ أي ﻣﺪى ﺗﺘﺒﺎﻋﺪ اﻟﻤﺮاﻛﺰ اﻟﻔﻌﺎﻟﺔ ﻟﻠﺸﺤﻨﺎت اﻟﻤﻮﺟﺒﺔ واﻟﺴﺎﻟﺒﺔ ﻓﻲ ھﺬا اﻟﺠﺰيء‬- i). 3.9x10-12 m ii). 99.2x10-49 m iii) -3.9x10-12 m iv) -99.2x10-49 m  - If the molecule is placed in electric field E = 1.5x104 N/C, what is the maximum torque can exert on it? ‫ ﻓﻤﺎ أﻗﺼﻰ ﻋﺰم ﯾﻤﻜﻦ أن ﯾﺆﺛﱢﺮ ﻋﻠﯿﮫ‬، E = 1.5x104 N / C ‫إذا ﺗﻢ وﺿﻊ اﻟﺠﺰيء ﻓﻲ اﻟﻤﺠﺎل اﻟﻜﮭﺮﺑﺎﺋﻲ‬ i) 9.3x10-26 N m ii) 5.85x10-8 N m iii) 15x104 N m iv) 24.18x10-30 N m - How much work needed to turn this molecule from θ1 = 0 to θ2 = 180? ‫؟‬θ2 = 180 ‫ إﻟﻰ‬θ1 = 0 ‫ ﻣﺎ ﻣﻘﺪار اﻟﺸﻐﻞ اﻟﻤﻄﻠﻮب ﻟﺘﺪوﯾﺮ ھﺬا اﻟﺠﺰيء ﻣﻦ‬- i). 18.6x10-25 J ii) 1.86x10-25 J iii) 16.8x10-25 J iv) 1.68x10-25 J 18. The lines of the electric field: ‫ﺧﻄﻮط اﻟﻤﺠﺎل اﻟﻜﮭﺮﺑﻲ‬ Starts from a negative charge and ends on a positive charge, ‫ﺗﺒﺪأ ﻣﻦ اﻟﺸﺤﻨﺔ اﻟﺴﺎﻟﺒﺔ‬ ‫و ﺗﻨﺘﮭﻲ ﻋﻨﺪ اﻟﺸﺤﻨﺔ اﻟﻤﻮﺟﺒﺔ‬ starts from a positive charge and ends on a negative charge, ‫ﺗﺒﺪأ ﻣﻦ اﻟﺸﺤﻨﺔ اﻟﻤﻮﺟﺒﺔ و‬ ‫ﺗﻨﺘﮭﻲ ﻋﻨﺪ اﻟﺸﺤﻨﺔ اﻟﺴﺎﻟﺒﺔ‬  19. The magnitude of the electric field E due to a point charge q at a distance r: (r) ‫( ﻋﻠﻲ ﺑﻌﺪ ﻣﺴﺎﻓﺔ‬q) ‫ﻣﻘﺪار اﻟﻤﺠﺎل اﻟﻜﮭﺮﺑﻲ ﻧﺘﯿﺠﺔ ﺷﺤﻨﺔ ﻛﮭﺮﺑﯿﺔ‬ depends inversely on r2, ‫ﺗﻌﺘﻤﺪ ﻋﻜﺴﯿﺎ ﻋﻠﻲ ﻣﺮﺑﻊ اﻟﻤﺴﺎﻓﺔ‬ is independent of r, ‫ﻻ ﺗﻌﺘﻤﺪ ﻋﻠﻲ اﻟﻤﺴﺎﻓﺔ‬ depends linearly on q, ‫ﺗﻌﺘﻤﺪ طﺮدﯾﺎ ﻋﻠﻲ اﻟﺸﺤﻨﺔ‬ is independent of q. ‫ﻻ ﺗﻌﺘﻤﺪ ﻋﻠﻲ اﻟﺸﺤﻨﺔ‬ 20. Strength of the electric field is ___________ Directly proportional to the force applied Inversely proportional to the force applied Directly proportional to the square of the force applied Inversely proportional to the square of the force applied 21. The force applied to a conductor is 10N if the charge in the conductor is 5C, what is the electric field intensity? 10V/m 2V/m 3V/m 15V/m 22. A point charge q1 = +8 nC is at the origin and a second point charge q2 = +12 nC is on the x axis at x = 4 m. Find the electric field on the y axis at y = 3 m. x ‫ ﻋﻨﺪ‬x ‫ ﺗﻘﻊ ﻋﻠﻲ ﻣﺤﻮر‬q2 = +12 nC ‫ ﺗﻘﻊ ﻓﻲ ﻧﻘﻄﺔ اﻷﺻﻞ و ﺷﺤﻨﺔ ﺛﺎﻧﯿﺔ‬q1 = +8 nC ‫ﺷﺤﻨﺔ ﻛﮭﺮﺑﯿﺔ‬.y = 3 m ‫ ﻋﻨﺪ‬y ‫ اوﺟﺪ اﻟﻤﺠﺎل اﻟﻜﮭﺮﺑﻲ ﻋﻨﺪ ﻧﻘﻄﺔ ﻋﻠﻲ ﻣﺤﻮر‬.= 4 m i) 7.99 N/C ii) 4.32 N/C iii) 11 N/C iv) 12.31 N/C 23. The following Figure shows the electric field lines for two point charges separated by a small distance, Determine the ratio q1/q2. ‫ أﺣﺴﺐ ﻧﺴﺒﺔ اﻟﺸﺤﻨﺔ اﻻوﻟﻲ‬.‫اﻟﺸﻜﻞ اﻟﺘﺎﻟﻲ ﯾﻮﺿﺢ ﺧﻄﻮط اﻟﻤﺠﺎل اﻟﻜﮭﺮﺑﻲ ﻟﺸﺤﻨﺘﺎن ﺑﯿﻨﮭﻤﺎ ﻣﺴﺎﻓﺔ ﺻﻐﯿﺮة‬ ‫اﻟﻲ اﻟﺸﺤﻨﺔ اﻟﺜﺎﻧﯿﺔ‬ i)-6/18 ii) +6/18 iii) 18/6 iv) -18/6