SI unit of permittivity is
 

1.  C2m2N2

2.  C2m-2N-1

3.  C2m2N-1

4.  C-1m2N-2

Subtopic:  Coulomb's Law |
 68%
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A spherical drop of capacitance 1μF is broken into eight drops of equal radius. Then, the capacitance of each small drop is
1.   μF
2.   μF
3.   μF
4.  8 μF
Subtopic:  Capacitance |
 52%
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A simple harmonic oscillator consists of a particle of mass m, and an ideal spring with spring constantk. The particle oscillates with a time period T. The spring is cut into two equal parts, Of one part oscillates with the same particles, the time period will
 
1.  2T
 
 
 

 


The coefficient of viscosity for hot air is
 

1.  greater than the coefficient of viscosity for cold air

2.  smaller than the coefficient of viscosity for cold air

3.  same than the coefficient of viscosity for cold air

4.  increase than the coefficient of viscosity for cold air

Subtopic:  Viscosity |
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An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energyE0. Its potential energy is
1.  -E0

 

Subtopic:  Satellite |
 64%
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A non-conducting body floats in a liquid at 20 °C with of its volume immersed in the liquid. When liquid temperature is increased to 100 °C, of body’s volume is immersed in the liquid. Then the coefficient of real expansion of the liquid is (neglecting the expansion of container of the liquid)
 
 
 
 

Two slabs A and B of different materials but of the same thickness are joined end to end to form a composite slab. The thermal conductivities of A and B are K1 and K2 respectively. A steady temperature difference of 12 °C is maintained across the composite slab. If K1 = , the temperature difference across slabs A is
 
1.  4 °C