Pri l. Electrons are aceleratedfresthh a potential iferece and hen pass hrough a

Question

Pri l. Electrons are aceleratedfresthh a potential iferece and hen pass hrough a 1. Electrons are accelerated from rest through a potential difference V, and then pass through a region between two parallel metal plates, as shown above. The region between the plates can contain a uniform electric field E and a uniform magnetic field B. With only the electric field present, the electrons follow path 1. With only the magnetic field present, the electrons follow path 3. As drawn, the curved paths between the plates show the correct direction of deflection for each field, but not necessarily the correct path shape. With both fields present, the electrons pass undeflected along the straight path 2 a. i. Which of the following describes the shape of the portion of path 1 between the plates? CIRCULARP Justify your answer. PARABOLIC HYPERBOLIC EXPONENTIAL ii. What is the direction of the electric field? INTO THE PAGE OUT OF THE PAGE TO THE LEFT TO THE RIGHT TO THE BOTTOM OF THE PAGE THE PAGE Justify your answer. b. i. Which of the following describes the shape of the portion of path 3 between the plates? CIRCULAR | PARABOLIC HYPERBOLIC EXPONENTIAL Justify your answer.

Explanation / Answer

Potential difference V= Vo

Initial speed = 0

Part (a);

shape of the portion of path 1 between plates is parabolic

Part (b);

Direction of electric field is from top plate to bottom plate

Part (c);

The shape of portion of path 3 between plates is circular.

Part (d);

v = E / B

E=3.4×104V/m

B= 2.0×10-3T

v=3.4×104/ 2.0×10-3

=1.7×107m/s

Part (e);

we know

v = 2Voq / m

Vo = ( 1/ 2q) mv^ 2

Vo=822.74 Volt

(80)

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