CONCEPTUAL QUESTIONS, Chapter 23-24 Phys 2401, Dr. Huang Fill in a T/F answer fo

Question

CONCEPTUAL QUESTIONS, Chapter 23-24 Phys 2401, Dr. Huang Fill in a T/F answer for each statement below 1. Although one can electrify a glass rod by rubbing it with silk, no net 2. 3. 4. charge is created. A proton carries positive charge, and weights the same as an electron The elementary charge equals 1.6x 10 C At any point P, the total electric field due to a group of point charges equals the vector sum of the electric fields of the individual charges. Electric field vector is tangent to the electric field line at each point. No two electric field lines can cross or touch 5. 6. 7. The force on a negative charge is in the opposite direction of the electric field. Electric flux can be understood as the number of electric field lines passing through a surface. 8. Gauss's law states that the net electric flux Gaussian surface is equal to the net charge inside the surface divided by 40. [ ] through any closed 10. Gauss's law is useful for calculating electric field when the charge distribution is highly symmetrical. At electrostatic equilibrium, the electric field is zero everywhere inside a conductor, and any charge can only be distributed on the surface of the conductor. 11 Electric field just outside a charged conductor is perpendicular to the surface and has a magnitude o/2E 12.

Explanation / Answer

1) TRUE

Reason:- Since,according to 'Law of conservation of charge',charge can be neither created nor destroyed but the

'net charge' of an isolated system remains constant .

Hence the given statement is TRUE

2) FALSE

Reason :- An electron and proton has a same magnituge of charge as " 1.602 * 10^(-19) " couloumbs.

But the mass of an electron is " 9.11 * 10^(-31) " kg while that of the proton is " 1.673 * 10^(-27) " kg .

Hence the given statement is FALSE

3) TRUE

Reason :- The charge on a fundamental particles i.e., electrons or protons are usually referred as an

elementary charge. charge on an electron or proton has a value of magnitude " 1.602 * 10^(-19) kg "

Hence the given statement is TRUE

4) TRUE

Reason :- Whenever at any point(p),if we have to find out electric field due to group of point charges.then as per

superposition principle,we have to find electric field due to an individual charges for all given charges to calculate

the electric field at given point(p).

Hence the given statement is TRUE

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