Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Casimir effect wikipedia , lookup
Magnetic monopole wikipedia , lookup
Fundamental interaction wikipedia , lookup
Circular dichroism wikipedia , lookup
Speed of gravity wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Aharonov–Bohm effect wikipedia , lookup
Electromagnetism wikipedia , lookup
Maxwell's equations wikipedia , lookup
Field (physics) wikipedia , lookup
Lorentz force wikipedia , lookup
repulsion between them is 0.025 N. calculate the final charge on each sphere. Class XII Physics Work Sheet CH-1 Q10. Two point charges having equal charges separated by 1m distance experiences a force of 8 N. What will be the force experience by the, if they are held in water at the same distance. (Given Kwater=80). Q11. How will you determine the direction of the electric field at a point in electric field? Q1. When a glass rod is rubbed with a silk cloth, charges appear on both. Explain how this phenomena is consistent with the law of conservation of charges. Q2. A polythene piece rubbed with wool is found to have negative charge of 3 x 10-7 C. i. estimate the number of electons transferred (from which to which). Ii. Is there a transfer of mass from wool to polythene? Q3. Two charges q1 and q2 separated by small distance, satisfy the equation q1+q2 = 0. What this tell us about the charges. Q4. Two identical metallic sphere A and having charges +4Q and -10Q are kept at certain distance apart. A third identical uncharged sphere C is first place in contact and then separated. Find the final charges on sphere A and B. Q5. i. Calculate the charge carried by 12.5x1018 electons. Ii. What is the basic difference between force between two masses and the force between the charges? Q6. Does coulomb’s force on two charges are in accordance with newton’s third law of motion? Q7. In coulomb’s law F=KE.q1q2/r2 states the factors on which the proportionality constant Ke depends. Q8. Q9. Is the force acting between two electrical point charges q1 and q2 kept at some distance apart in air, attractive or repulsive when (i)q1.q2>0 ii.q1 q2 <0. Two identical metal spheres, having unequal opposite charge are placed at a distance of 0.90 m apart in air. After bringing them in contact with each other, they are again placed at the same distance apart. Now the force of Q12. Why you take the test charge q0 very small i.e.q0 0. Q13. Two point electric charges of unknown magnitude and the sign are placed at a distance d apart. The electric intensity is zero at a point, not between the charge but on the line joining the. Write the essential condition for this. Q14. The force on an electron kept in an electric field in a particular direction is F. what will be the magnitude and the direction of the force experienced by a proton kept at the same position? Mass of the proton is about 1836 times the mass the electron. Q15. Calculate the electric field strength required just to balance a water drop of mass 10-7 kg and having a charge of 1.6x10-19 C. (g=10 m/s2) Q16. A particle of mass m and charge q is release in uniform electric field of intensity E. calculate the kinetic energy it attain moving a distance x. Q17. Why electric field lines: i. can never intersect each other. ii. Cannot form closed loop. Iii. Cannot have break in between. Q18. In the figure, electric field line due to point charges q1 and q2? i. what are the sign of charges q1 and q2 ii. What is the ratio of q1 and q2? Q30. Derive an expression for electric field intensity at a point on the axial line of an electric dipole. Q31. Derive an expression for intensity of the electric field at a point on the equatorial line of dipole. Q32. A spherical conductor is placed in uniform electric field. Which path is followed by the lines of force? Q19. Sketch the electric field line, when a positively charge is kept near a conducting plate. Q20. Define electric flux. Give its SI unit. Q21. A spherical balloon carries a charge which is uniformly distributed over its surface. As the balloon is blown up and increases in size, how does the electric flux coming out the surface of the balloon change? Q22. State and prove gauss’s theorem in electrostatics. Q23. Using Gauss’s theorem, derive an expression for electric field due to a uniformly charged wire of infinite length. Q24. Derive an expression for electric field due to a uniformly charged infinite plane. Q25. Applying gauss theorem, find the electric field at any point due to an infinitely charged conducting plate. Q26. Two infinitely parallel plates having charge density (I) +σ, +σ (ii) +- σ. Derive an expression for the electric field intensity (a) in the region between two plate (b) outside. In what way does the infinite extension of the plates simplify the derivation? Q27 derive an expression for the electric field due to a uniformly charged thin spherical shell. Q28. Define an electric dipole and dipole moment. Give its SI unit. Q29. An electrical dipole is placed in an external field of strength E. calculate the torque experienced by it, when it rotated through a given angle. Hence, define electric dipole moment. i. identify two pairs of perpendicular vectors in the expression. ii. Show diagrammatically the orientation of the dipole in the field for which the torque is (a) maximum (b) half the maximum value (c) zero.