A heater is being designed that uses a coil of nichrome wire (ρ = 100x10-8 Ω·m) to generate 100 W using a voltage of V=220V. The wire is 2000 m long. What cross sectional area should the wire have? None of the above 1.7e-2 m2 7.23e-4 m2 4.13e-6 m2 2.06e-3 m2 What is the magnification of a converging lens with a focal length of 7.5 cm when an object is held 5 cm from it? 3.00 2.14 1.36 5.00 None of the above A proton is moving 5m/s upwards and is 2cm to the right of a wire which is carrying 3 A of current downwards. What is the direction of the force experienced by the proton? Out of the page None of the above To the right To the left Into the page A 5 kg object has a net charge of -78 mC and is in an external electric field. What is the direction and magnitude of the electric field required to cancel the force due to gravity (gravitational field points down)? 628.20 N/C downwards 64.10 upwards 64.10 downwards None of the above 628.20 N/C upwards Two protons are placed 3mm apart and fixed in place. If one proton is then set free, what is the maximum velocity it will reach? None of the above 38.9 m/s 2.32e2 m/s 7.58e8 m/s 9.6 m/s An uncharged capacitor is connected in series with a battery and a resistor. In terms of the time constant τ, how long does it take the capacitor to charge to 1/3 its max charge? 0.205τ 1.10τ 3τ None of the above 0.405τ A 20 turn circular loop with diameter 3 cm is placed in a magnetic field of strength 7 T such that the loop’s area vector is parallel to the magnetic field. The magnetic field is reduced to 0 T over some time and this generates a constant voltage of 5 V. How long did it take for the magnetic field to reduce to 0? 3.23 s 15.32 s 0.0198 s 0.0389 s None of the above There are two charges q1 = 35 μC and q2 = 50 μC placed 0.5 m apart and fixed in place. If q2 has a mass of 3 g, what is the magnitude of the acceleration it will experience the moment it is free to move? Note: q2 is not in any gravitational field 9.8 m/s2 None of the above 21e3 m/s2 10.5e3 m/s2 3.38e2 m/s2
Refraction of Light
Refraction is a change in the direction of light rays when they travel from one medium to another. It is the bending of light when it goes through different media.
Angle of Refraction
Light is considered by many scientists to have dual nature, both particle nature and wave nature. First, Particle nature is one in which we consider a stream of packets of energy called photons. Second, Wave nature is considering light as electromagnetic radiation whereas part of it is perceived by humans. Visible spectrum defined by humans lies in a range of 400 to 700 nm wavelengths.
Index of Refraction of Diamond
Diamond, the world’s hardest naturally occurring material and mineral known, is a solid form of the element carbon. The atoms are arranged in a crystal structure called diamond cubic. They exist in a huge variety of colours. Also, they are one of the best conductors of heat and have a very high melting point.
A heater is being designed that uses a coil of nichrome wire (ρ = 100x10-8 Ω·m) to generate 100 W using a voltage of V=220V. The wire is 2000 m long. What cross sectional area should the wire have?
What is the magnification of a converging lens with a focal length of 7.5 cm when an object is held 5 cm from it?
A proton is moving 5m/s upwards and is 2cm to the right of a wire which is carrying 3 A of current downwards. What is the direction of the force experienced by the proton?
A 5 kg object has a net charge of -78 mC and is in an external electric field. What is the direction and magnitude of the electric field required to cancel the force due to gravity (gravitational field points down)?
Two protons are placed 3mm apart and fixed in place. If one proton is then set free, what is the maximum velocity it will reach?
An uncharged capacitor is connected in series with a battery and a resistor. In terms of the time constant τ, how long does it take the capacitor to charge to 1/3 its max charge?
A 20 turn circular loop with diameter 3 cm is placed in a magnetic field of strength 7 T such that the loop’s area vector is parallel to the magnetic field. The magnetic field is reduced to 0 T over some time and this generates a constant voltage of 5 V. How long did it take for the magnetic field to reduce to 0?
There are two charges q1 = 35 μC and q2 = 50 μC placed 0.5 m apart and fixed in place. If q2 has a mass of 3 g, what is the magnitude of the acceleration it will experience the moment it is free to move? Note: q2 is not in any gravitational field
9.8 m/s2
None of the above
21e3 m/s2
10.5e3 m/s2
3.38e2 m/s2
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