1st Year Physics Chapter 10 Test10. Electrostatics

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Electric field is related to potential gradient by:
   1. E = qΔV
   2. E = Δr/ΔV
   3. E = -ΔV/Δr
   4. E = V/r
2. If two points are at same potential, are there any electric field lines connecting them?
   1. Yes
   2. No
   3. May or may not
   4. Insufficient information.
3. Inside a Faraday cage, the electric field is:
   1. Maximum
   2. Zero
   3. Variable
   4. Constant
4. A charge +q placed in an electric field experiences a force:
   1. Opposite to E
   2. Along the direction of E
   3. Perpendicular to E
   4. Zero
5. The region between opposite charges where field is strong is due to:
   1. Low density of lines
   2. No field
   3. Circular lines
   4. High density of lines
6. The strength of electric field is proportional to:
   1. Number of field lines per unit area
   2. Mass of the charge
   3. Distance squared
   4. Temperature
7. A charged sphere behaves as a point charge when:
   1. Observed from inside the sphere
   2. Observed from outside the sphere
   3. Sphere is non-conducting
   4. Sphere is moving
8. Coulomb's force varies directly with:
   1. Distance
   2. Square of distance
   3. Product of charges
   4. Sum of charges
9. If F is the force on test charge q, electric field E is:
   1. F × q
   2. F/q
   3. q/F
   4. F - q
10. The electric field lines due to a positive charge:
    1. Point inward
    2. Point outward
    3. Form closed loops
    4. Are parallel