A beam of positive particles is shot between two charged parallel plates that al

Question

A beam of positive particles is shot between two charged parallel plates that also contain a magnetic field into the page. The voltage on the parallel plates is adjusted until the electric force balances the magnetic force, causing the beam to travel straight. In which direction must the electric field point? Up the page. Down the page. Into the page. Out of the page. If the particles were moving at half the speed through the same E and B fields, what would it do? Continue to travel strait Curve up the page Curve down the page If the Voltage on the plates was increased, what would the beam of panicles do? Continue to travel strait Curve up the page Curve down the page Curve out of the page Curve into the page Two long parallel wires are a distance 2a apart, as shown above. Point P is in the plane distance a from wire X. When there is a current I in wire X and no current in wire Y, the magnetic field at P is B_o. When there are equal currents I in the same direction in both magnitude of the magnetic field at a point midway between the wires? 0 B_0

Explanation / Answer

8)

for the magnetic force on the particles

the direction of magnetic force is upwards

hence, to balance the magnetic force , the direction of electric force must be downwards

the direction of electric field must be B) Down the page

9)

as the magnetic field will be decrased to half

hence , the particle will accelerate in the direction of electric force

the correct answer is

C) curve down the page

10)

if the voltage is increased

the electric force on the particle will increase

hence , the particle will accelerate in the direction of electric force

the correct answer is

C) curve down the page

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