ساکن برقیات

Written by Dr. Hamza Farooq (Physics)

بارہویں جماعت · طبیعیات · 9 سوالات

نام: ____________________   تاریخ: ____________

1. Two point charges of 2 microcoulomb and 3 microcoulomb are 3 m apart in air. The force between them is about: (k = 9 x 10⁹ N m²/C²)

   • A 6 x 10⁻³ N
   • B 1.8 x 10⁻² N
   • C 2 x 10⁻³ N
   • D 6 x 10⁻⁶ N

2. The electric field inside a charged conductor in equilibrium is:

   • A Infinite
   • B Maximum
   • C Equal to the surface field
   • D Zero

3. The SI unit of electric field is:

   • A C/N
   • B J/C only
   • C N/C
   • D N m

4. Two plates of a capacitor are 2 mm apart with a potential difference of 100 V. The field between them is:

   • A 5 x 10⁴ V/m
   • B 2 x 10⁵ V/m
   • C 200 V/m
   • D 5 x 10² V/m

5. Capacitors in parallel have a combined capacitance equal to:

   • A The reciprocal of the sum
   • B The product
   • C The smallest one
   • D The sum of the capacitances

6. Gauss's law relates the electric flux through a closed surface to the:

   • A Charge enclosed
   • B Outside charge
   • C Surface area only
   • D Mass

7. The energy stored in a capacitor of capacitance C charged to voltage V is:

   • A 1/2 C V
   • B C V
   • C 1/2 C V²
   • D C V²

8. A dielectric placed between capacitor plates:

   • A Does not change it
   • B Decreases the capacitance
   • C Increases the capacitance
   • D Removes the charge

9. The electric potential at a point is the work done per unit charge in bringing a:

   • A Positive test charge from infinity
   • B Negative charge to the earth
   • C Mass from the ground
   • D Neutron from infinity