Which of the following statement is true? Assume that a uniform magnetic field i

Question

Which of the following statement is true? Assume that a uniform magnetic field is directed into this page. If a proton is released with an initial velocity going to the left, which of the following describes the direction of the resultant force acting on the proton? A bi-convex lens has a focal length of magnitude F. At which of the following distances from this lens would object give a real, inverted and diminished image? If the front surface of a convex-concave lens has a radius 20cm, the back surface has a radius of 30 the lens is made by glass (n=1.5). Find the focal length?

Explanation / Answer

1. as magnetic monopoles doesnot exists, the option of E seems to be correct

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2. apply flemings left hand rule to determine the direction of magnetic force

this states that if forefinger of our left hand points in the direction of magnetic field

and middle finger indicates the direction of spee

then thumb indicates the direction of magnetic force

so option e would be correct , going down

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in order to get a real and inverted image

objetc must be placed at half of the focal length

so answer is option A

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use lens maker formula

1/f = (n-1) *(1/R1 - 1/R2)

1/f = (1.5-1) *(1/0.2 -1/0.3)

1/f = 0.834

f = 1.2m   or   120 cm

option D it is

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