a)Two long parallel wires carry currents of 4 A and 7 A in the opposite directio

Question

a)Two long parallel wires carry currents of 4 A and 7 A in the opposite direction. The wires are separated by 0.24 m. a) Find the magnetic force per unit length between the two wires. b) Find the magnetic field midway between the wires c) Find the magnetic force on each wire. The wires are then suspended horizontally one above the other with the currents flowing in same direction. d) If the upper wire is held securely without sagging, for what mass/length will the lower wire be suspended without sagging. (Hint: there are two forces on lower wire that are exactly balanced)

b)A 5mm high object is placed 20cm from a 5cm focal length converging lens.

a) The image is real or virtual Blank 1 (1 pt)

b) The image is upright or inverted Blank 2 (1 pt)

c) The image distance is Blank 3 cm (3 pt)

d) The image height is Blank 4 cm (3 pt)

Explanation / Answer

1/di = 1/f - 1/do
1/di = 1/5 - 1/20
di = 20/3 cm <==ans
M = hi/ho = - di/do
M = hi/5 = - 20/(20*3)
hi = - 5/3 cm

di is positive, it is a real image located opposite side of the lens
hi is negative, it is a real image inverted image

Post the other question seperately.

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