A magnet is pushed into a coil. Which of the following is true? Negative image d

Question

A magnet is pushed into a coil. Which of the following is true? Negative image distance indicates that the image formed is___virtual real both a and b neither a and B An object is placed 72cm in front of a conves mirror whose radius=18cm. What is the image distance? 10.28cm 10.28cm 8cm -8cm The resistance of a wire depends upon the wire's___material length area all of them A charge Q= 200 micro coulomb moves with a v=2000m/s in EAST direction is a region where there is a a magnetic field B= 2 T in the EAST direction. The magnetic force exerted on the charge is___0.4N 0.6N 0N 0.8N A negative magnification for u mirror means___the image is real and inverted the image is real and upright the image is virtual and inverted the image is virtual and upright Which of the following is false? Electric current produces magnetism A neutron moving in a magnetic field will never experience a magnetic force North and South poles can be separated by cutting a magnet into two pieces A charged particle at rest will not experience a magnetic force Images formed by a flat mirror are always inverted and real upright and real inverted and virtual upright and virtual If the index of refraction of a medium is increased, speed of light in the medium increases decreases remains the same none of these

Explanation / Answer

11) B

12) A) virtua;

13) D) -8 cm

f = -R/2 = -18/2 = -9 cm

object distance, u = 72 cm

let v is the image distance

Apply, 1/u + 1/v = 1/f

1/v = 1/f - 1/u

1/v = 1/(-9) - 1/72

v = -8 cm

14) D) all of them

R = rho*L/A

rho --> resistivity of material

L --> length of the wire

A---> cross sectional area

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