a positive charge q of mass m is moving along the x axis We wish to apply a uniform magnetic - Physics - Moving Charges and Magnetism

Question

a positive charge q of mass m is moving along the x axis We wish to
apply a uniform magnetic field B for time Δ t so that charge
reverses its direction crossing the y axis at a distance d Then
what is the magnitude of B

Shobhit Mittal · Accepted Answer

for  the reverse direction it must complete semi circle
hence the radius of the path be r=d2speed v=πr∆t=πd2∆tr=mvBqB=mvrq=mπd2∆td2q=mπ∆t
qRegards

a positive charge q of mass m is moving along the x axis.We wish to apply a uniform magnetic field B for time Δ t so that charge reverses its direction crossing the y axis at a distance d..Then what is the magnitude of B