Two point masses, m each carrying charges `-q` and `+q` are attached to the ends of a massless rigid non - conducting wire of length L. When this arrangement is placed in a uniform electric field, then it deflects through an angle `theta`. The minimum time needed by the rod to align itself along the field is

Two charged particles each of mass 9.8 g and charges + 20 mu C and -20 mu C are attached to the two ends of a massless and rigid uniform non-conducting rod of length 50 cm. This arrangement is held in a uniform electric field of 12.1 NC^(-1) such that the rod makes a very small angle with the field direction. If the rod is set free the minimum time needed for the rod to become parallel to the direction of the electric field is ............ seconds.

Two small balls of mass Meach carrying charges +Q and -Q , connected by a massless rigid non-conducting rod of length L lie along x-axis as shown. A uniform electric field vecE=3hatk+3hatj has been switched on. The angular velocity vectorof the dipole when dipole nioment aligns with the electric field is :

Two point masses of mass m and equal and opposite charge of magnitude q are attached on the corners of a non-conducting uniform rod of mass m and the system is released from rest in uniform electric field E as shown in figure from theta=53^(@) (i) Find angular acceleration of the rod just after releasing (ii) What will be angular velocity of the rod when it passes through stable equilibrium. (iii) Find work required to rotate the system by 180^(@) .

A particle of mass 'm' and charge 'q' is suspended from the ceiling with the help of an insulating wire of length 'l' . It is placed in an uniform electric field as shown in figure. Then the time period of oscillation is

A particle of mass 'm' and charge 'q' is suspended from the ceiling with the help of an insulating wire of length 'l' . It is placed in an uniform electric field as shown in figure. Then the time period of oscillation is

Two masses each of mass M are attached to the end of a rigid massless rod of length L . The moment of interia of the system about an axis passing centre of mass and perpendicular to its length is.

Two masses each of mass M are attached to the end of a rigid massless rod of length L . The moment of interia of the system about an axis passing centre of mass and perpendicular to its length is.

A point particle of mass M is attached to one end of a massless rigid non-conducting rod of length L. Another point particle of the same mass is attached to the other end of the rod. The two particles carry charges +q and -q respectively. This arrangement is held in a region of a uniform electric field E such that the rod makes a small angle theta (say of about 5 degree) with the field direction, fig. Find an expression for the minimum time needed for the rod to become parrallel to the field after it is set free.