Moving Charges ...

The particles emitted by a radioactive substance are deflected in a magnetic field. The particle may be

A person is facing magnetic north. An electron in front of him flies horizontally towards the north and deflects towards east. He is in/at the 

Cathode rays are made to pass between the poles of a magnet. The effect  of magnetic field is 

A charged particle of mass $$10^{-3}$$ kg and charge $$10^{-5}C$$ enters a magnetic field of induction 1 T. If $$g=10 ms^{-2}$$ for what value of velocity will it pass straight through the field without deflection?

An electron is accelerated from rest through a potential difference $$V$$. This electron experiences of force $$F$$ in a uniform magnetic field. On increasing the potential difference to  $$V^{'}$$, the force experienced by the electron in the same magnetic field becomes $$2F$$. Then, the ratio $$\dfrac{V^{'}}{V}$$  is equal to

In a region of space, a uniform magnetic field $$B$$ exists in the $$x-$$direction. An electron is fired from the origin with its initial velocity $$u$$ making an angle $$\alpha$$ with the y direction in the $$yz$$ plane. In the subsequent motion of the electron,

A charged particle moves with velocity $$\vec v=a\hat i+d\hat j$$ in a magnetic field $$\vec B=A\hat i+D\hat j$$. The force acting on the particle has magnitude $$F$$. Then,

A charged particle is whirled in a horizontal circle on a frictionless table by attaching it to a string fixed at one end. If a magnetic field is switched on in the vertical direction, the tension in the string

A particle of specific charge $$\dfrac {q}{m}=\pi  \ C kg^{-1}$$ is projected from the origin toward positive $$x-$$axis with a velocity of $$10\ ms^{-1}$$ in a uniform magnetic field $$\overrightarrow{B}=-2\hat{k}  T$$. The velocity $$\overrightarrow{v}$$ of particle after time $$t=\dfrac{1}{12}\ s$$ will be $$($$in $$ms^{-1})$$

If a copper rod carries a direct current, the magnetic field associated with the current will be: