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1. In \"magnetic force on a current carrying wire\" experiment, using the data for force(y-axis, in...

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Physics

1. In \"magnetic force on a current carrying wire\" experiment,using the data for force(y-axis, in Newton) versus length (inmeters), someone obtained a linear curve fit equation: y=0.1x+2. Ifin the experiment, the wire carrying a current I=2.0 A, how strongis the magnetic field?

A. 0.1 T

B. 0.05 T

C. 2 T

D. 0.2 T

2. If the distance between the object and the screen is 1meter,a thin lens is put in between and moving, when the lens is 30 cmaway from the object, a clear image is formed on the screen. Howmuch is the focal length of this thin lens?

A. 0.048 m

B. 21 cm

C. 0.019 m

D. 52.5 cm

3. When light, starting in air, is shone on a piece of glass,what effects should you likely to observe?

A.Reflection

B. Refraction

C. Both reflection and refraction

D. Inversion

E. Conversion

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