An ionised gas contains both positive an...

An ionised gas contains both positive and negative ions initially at rest. If it is subjected simultaneously to an electric field along the +x-direction and a magnetic field along the +z-direction, then

positive ions deflect towards + y direction and negative ions towards - y direction

all ions deflect towards +y direction

all ions deflect towards - y direction

positive ions deflect towards - y direction and negative ions towards + y direction.

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