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An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 × 104 N C-1 in Millikan’s oil drop experiment. The density of the oil is 1.26 g cm-3. Estimate the radius of the drop. (g = 9.81 m s-2; e= 1.6 × 10-19 C)
By Nilima Nilima, Mar 22, 22 
Topic Tags:  NCER ,
  Physics
1
208
By Mukesh Kaple
2 years ago
A spherical conductor of radius 12 cm has a charge of 1.6 × 10-7 C distributed uniformly on its surface. What is the electric field
By Nilima Nilima, Mar 23, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
202
By Mukesh Kaple
2 years ago
Three capacitors each of capacitance 9 μF are connected in series. (a) What is the total capacitance of the combination? (b) What is the potential difference across each capacitors if the combination is connected to a 120 V supply?
By Nilima Nilima, Mar 23, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
274
By Mukesh Kaple
2 years ago
A parallel plate capacitor with air between the plates has a capacitance of 8 μF. What will be the capacitance if the distance between the plates is reduced by half, and the space between them is filled with a substance of dielectric constant 6?
By Nilima Nilima, Mar 23, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
175
By Mukesh Kaple
2 years ago
Two charges 2 μC and -2 μC are placed at points A and B 6 cm apart. Identify an equipotential surface of the system. What is the direction of the electric field at every point on this surface?
By Nilima Nilima, Mar 23, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
151
By Mukesh Kaple
2 years ago
A regular hexagon of side 10 cm has a charge 5 μC at each of its vertices. Calculate the potential at the center of the hexagon.
By Nilima Nilima, Mar 23, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
144
By Mukesh Kaple
2 years ago
Two charges 5 × 10-88 C and -3 × 10-8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
By Nilima Nilima, Mar 23, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
329
By Nilima Nilima
2 years ago
Suppose that the particle in question 33 is an electron projected with velocity vx = 2.0 × 106 m s-1. If E between the plates separated by 0.5 cm is 9.1 × 102 N C-1 where will the electron strike the upper plate? (|e| = 1.6 × 10-19, me = 9.1 × 10-31 ...
By Nilima Nilima, Mar 22, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
91
By Nilima Nilima
2 years ago
A particle of mass m and charge (-q) enters the region between the two charged plates initially moving along x-axis with speed vx.The length of plate is L and an uniform electric field £ is maintained between the plates. Show that the vertical deflec...
By Nilima Nilima, Mar 22, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
92
By Nilima Nilima
2 years ago
(a) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = o) of the configuration. Show that the equilibrium of the test charge is necessarily unstable, (b) Verify this result for the ...
By Nilima Nilima, Mar 22, 22 
Topic Tags:  NCERT , Class 12 ,
  Physics
1
102
By Nilima Nilima
2 years ago
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