a. Electric dipole
b. τ = P× E
= PESinθ ,(θ = 90:Sin90=1 )
= QaE
= 3×10-6 ×5×10-3×3×10-5
= 45×10-14 Nm
c. both translational motion and rotational motion
Tuesday, June 28, 2011
Electro statics
Two charges +3μ C and -3 μ C are separated by a very small distance of 5 m.m.
a). What is the name of the above arrangement
b). If the above arrangement is placed in a uniform electric field of intensity 3×10-5 N/C with
its axis perpendicular to the field direction, what is the torque acting on it?
c. If the arrangement is placed in a non uniform electric field, what happens?
a). What is the name of the above arrangement
b). If the above arrangement is placed in a uniform electric field of intensity 3×10-5 N/C with
its axis perpendicular to the field direction, what is the torque acting on it?
c. If the arrangement is placed in a non uniform electric field, what happens?
Monday, June 27, 2011
Electro statics- (Questions)
1) By how many times the force between two charged bodies gets increased ,if their charges are doubled and the distance between them is halved?
2) Two pith-balls of mass 0.0004Kg are suspended from the same point by silk threads 0.25m long.Equal charges are given to the balls which separate until the threads enclose an angle of 30 degree. Calculate the charge on each pith-ball.
3) Two point charges whose magnitudes are in the ratio 2:3 separated by 2cm repel each other with a force of 3375N .Find the magnitude of the charges.
4)Two charged identical lead balls P and Q have their centres separated by a distance of 3cm and carries a charge of 9μC each.A third identical lead ball R is brought in contact with P and removed.It is then brought in contact with Q and removed.What is the new force of repulsion between P and Q?
2) Two pith-balls of mass 0.0004Kg are suspended from the same point by silk threads 0.25m long.Equal charges are given to the balls which separate until the threads enclose an angle of 30 degree. Calculate the charge on each pith-ball.
3) Two point charges whose magnitudes are in the ratio 2:3 separated by 2cm repel each other with a force of 3375N .Find the magnitude of the charges.
4)Two charged identical lead balls P and Q have their centres separated by a distance of 3cm and carries a charge of 9μC each.A third identical lead ball R is brought in contact with P and removed.It is then brought in contact with Q and removed.What is the new force of repulsion between P and Q?
Sunday, June 26, 2011
Saturday, June 25, 2011
Friday, June 24, 2011
Inclined Plane Problem
A rope rests on two platforms which are both inclined at an angle θ. The rope has uniform mass density, and its coefficient of friction with the platforms is 1. The system has left-right symmetry. What is the largest possible fraction of the rope that does not touch the platforms? What angle θ allows this maximum value?
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