Question

An electron traveling with a speed u along the positive
x-axis enters into a region of magnetic field where B = –B₀
k ˆ ( x > 0). It comes out of the region with speed v then
(a) v = u at y > 0 (b) v = u at y < 0
(c) v > u at y > 0 (d) v > u at y < 0

Answer 1

jwjwHard X-rays for the study of fractures in bones should have

a minimum wavelength of 10⁻¹¹ m. The accelerating voltage

for electrons in X-ray machine should be

(a) < 124 kV

(b) > 124 kV

(c) between 60 kV and 70 kV

(d) = 100 kVHard X-rays for the study of fractures in bones should have

a minimum wavelength of 10⁻¹¹ m. The accelerating voltage

for electrons in X-ray machine should be

(a) < 124 kV

(b) > 124 kV

(c) between 60 kV and 70 kV

(d) = 100 kV8i2i27171××~×~+/~;~_~^#*(@×#+--_÷@××××-÷

Answer 2

Answer:

F

=q(

v

×

B

)=−e(u

i

^

×B(−

k

^

))=euB(−

j

^

)

The spped will not change in a magnetic field.

The electron will not have y>0 during its course of motion.