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Class notes ELECTRIC CHARGE AND FIELD
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Some examples from this set of practice questions
1.
1. Which statement among the following is false regarding Gauss’s law? (a) Gauss’s law holds for any closed surface. (b) In Gauss’s law, the term “q” on the right side of the equation represents the total charge enclosed within the surface. (c) When a system exhibits symmetry, Gauss’s law may not be beneficial for calculating the electrostatic field. (d) Gauss’s law is derived from Coulomb’s law, which contains an inverse square dependence on distance.
Answer: (c) When a system exhibits symmetry, Gauss’s law may not be particularly useful for calculating the electrostatic field.
2.
2. Assume a system inside which there are different types of charges, but the total charge is practically zero. At points outside the given region (a) the electric field must be zero. (b) the electric field is caused solely by the dipole moment of the charge distribution. (c) For large distances (r) from the origin, the dominant electric field is inversely proportional to r3. (d) if a charged particle is moved along a closed path away from a region, the work done will not be zero.
Answer: (c) For large distances (r) from the origin, the dominant electric field is inversely proportional to r3.
3.
3. The quantisation of charge implies that (a) it is not possible for a charge to be a fraction of the charge on an electron. (b) charges cannot be destroyed (c) charge exists on particles, and there is a minimum allowable charge for a particle.
Answer: (a) it is not possible for a charge to be a fraction of the charge on an electron.
4.
4. If a parrot sits on a bare high-voltage power line, it will: (a) receive a mild shock (b) receive a strong shock (c) be killed instantly (d) not be affected significantly.
Answer: (d) not be affected significantly
5.
5. If two conducting spheres are charged separately and then connected, the following may occur: (a) The electrostatic energy of the spheres will be conserved. (b) the total charge on the spheres is conserved (c) Both the electrostatic energy and charge will be conserved. (d) None of the above.
Answer: (b) the total charge on the spheres is conserved
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