the balls are held at a separation 5cm apart and thrt released.Find (a) the components of the resultant force on it along and perpendicular to the string (b) the acceleration of one of the balls.
A fully charged capacitor has a capacitance ‘C’. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity ‘s’ and mass ‘m’. If the temperature of the block is raised by ‘ DT’, the potential difference ‘V’ across the capacitance is
In the following figure the resultant capacitance between A and B is . The capacitance C is
are point charges located at points as shown in the figure and s is a spherical Gaussian surface of radius R. Which of the following is true according to the Gauss’s law
None of the above
An electron of mass and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be
Two point charges (+Q) and (– 2Q) are fixed on the X-axis at positions a and 2a from origin respectively. At what position on the axis, the resultant electric field is zero
In general, metallic ropes are suspended on the carriers which take inflammable material. The reason is
There speed is controlled
To keep the centre of gravity of the carrier nearer to the earth
To keep the body of the carrier in contact with the earth
Nothing should be placed under the carrier
Answer :- C
Option 1 says to controll speed . But for that pourpose we can use another materials, hence it is incorrect.
Option 2 says to keep center of gravity near earth . But for that we can decrease height of carrier, hence it is incorrect.
Option 3 says to keep body near earth, here due to friction of air spark can be genrate hence we use metallic wire which are connected to earth causing earthing and prevent accident, hence it is correct.
Option 4 says that nothing should place under carrier it will make spark and an accident.