The voltage of clouds is 4×10⁶ volt with respect to ground. In a lightening strike lasting 100 m sec, a charge of 4 coulombs is delivered to the ground. The power of the lightening strike […]
The order of the electric field near the earth’s surface is
Options
(a) 100 v/m (b) 500 v/m (c) 200 v/m (d) none of these
Correct Answer:
100 v/m
Explanation:
The electric field […]
Two point charges +2 coulomb and +10 coulomb repel each other with a force of 12 N. Charges of -2 coulomb are given to each of these charges, then the force of interaction is
A parallel plate capacitor of a capacitance 1 pF has seperation between the plates is d. When the distance of seperation becomes 2d and wax of dielectric constant x is inserted in it the capacitance […]
The specific charge of a proton is 9.6×10⁷ C/kg. The specific charge of an alpha particle will be
Options
(a) 9.6 x 10⁷ C kg⁻¹ (b) 19.2 x 10⁷ C kg⁻¹ (c) 4.8 x […]
The unit of permitivity of free space, ε₀ is
Options
(a) coulomb/newton-metre (b) Newton x metre²/coulomb² (c) coulomb²/newton-metre² (d) coulomb²/(newton x metre)²
Correct Answer:
coulomb²/newton-metre²
Explanation:
No explanation available. Be the first to […]
A spherical drop of mercury having a potential of 2.5 v is obtained as a result of merging 125 droplets. The potential of the constituent droplets would be
Options
(a) 1.0 V (b) 0.5 […]
Two capacitors of capacitances 2 μF and 3 μF are joined in series. Outer plate of first capacitor is at 1000 volt and outer plate of second capacitor is earthed (grounded). Now the potential on […]
The unit of electric permittivity is
Options
(a) volt/m² (b) joule/coulomb (c) farad/m (d) henry/m
Correct Answer:
farad/m
Explanation:
Electric permitivity has unit farad/m.
The electric potential at the surface of an atomic nucleus (z=50) of radius 9.0×10⁻¹³ cm is
Options
(a) 80 volt (b) 8×10⁶ volt (c) 9 volt (d) 9×10⁵ volt
Correct Answer:
8×10⁶ volt
Explanation: […]
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