A wire of length "L" and mass "m" is kept on a rough horizontal surface of coefficient of friction mu. There exists a uniform magnetic field B in vertical downward direction. A charge q is passed through the wire in a very small time interval. The wire will come to rest after a time find ,((qLB)^(x))/(mu mg) Find value of x

A uniformly conducting wire is bent to form a ring of mass 'm' and radius 'r' , and the ring is placed on a rough horizontal surface with its plane horizontal. There exists a uniform and constant horizontal magnetic field of induction B . Now a charge q is passed through the ring in a very small time interval Deltat . As a result the ring ultimately just becomes vertical. Calculate the value of g (acceleration due to gravity) in terms of other given quantities. Assume that friction is sufficient to prevent slipping and ignore any loss in energy.

A body of mass M is resting on a rough horizontal plane surface the coefficient of friction being equal to mu At t = 0 a horizontal force F = F_(0) t starts acting on it , where F_(0) is a constant find the time T at which the motion starts?

A particle of mass m is thrown along a horizontal surface with speed u and comes to rest after travelling a distance x_(0) . A uniform magnetic field B_(0) is switched on in vertically downward direction and the particle is projected as before after putting a charge q on it. This time it travelled through a distance X_(1) before stopping. Now the experiment is repeated with a uniform electric field E0 in addition to the magnetic field, electric field being parallel to the magnetic field. Particle having mass m and charge q is projected as earlier and found to travel a distance X_(2) before stopping. Find X_(1) and x_(2)

A block of mass m moving with a velocity v_(0) on a rough horizontal surface from x=0 coefficient of friction is given by mu=mu_(0)=ax . Find the kinetic energy of the block as function of x before it comes to rest.

A metal wire of mass m slides without friction on two horizontal rails spaced distance d-apart as shown in figure. The rails are situated in a uniform magnetic field B, directed vertically upwards, and a battery is sending a current I through them. Find the velocity of the wire as a function of time, assuming it to be at rest initially.

There exists a uniform magnetic field in horizontal direction perpendicular to the plane of the paper as shown in Fig. A wire of length 1 and mass m is attached with a block of equal mass with the help of an ideal string. The block is kept on floor and the wire on two conducting support as shown. After closing the switch, a charge q passes though the wire for a small interval of time. To what height the block will rise? (take(qBl)/m = 20)

On a horizontal rought rood , value of coefficient of friction mu =0.4 .Find the minimum time in which a distance of 400m can be covered. The car start from rest and finally comes to rest.

A uniform straight horizontal conductor of mass m and length l is pivoted at one end on a smooth horizontal surface. A vertical magnetic field B is present. A charge Q is passed through conductor at once. Find the angular velocity gained by the rod.