A proton moving at velocity v enters a magnetic field B and is accelerated by th

Question

A proton moving at velocity v enters a magnetic field B and is accelerated by the resulting magnetic force, say in general, about the resulting change in the velocity v of the proiun? A) Onlv the magnitude changcs. D) Only the direction changes. (CyBoth the magnitude and direction 5. Recall my demonstration of the solenoid which I turned on and off very quickly. Which of the following true? A) This demonstration was able to make an incandescent light bulb glow without any wires connecting the light bulb. B) This demonstration showed Faraday s Law of InductionC) The demonstration was capable of launching an aluminum ring with magnetic fields. I)) One of the above statements is false

Explanation / Answer

2)

How do Magnetic poles interact ?

Opposite poles attract and like repel <---------ANSWER

3)

total resistance in the upper half of the curcuit = 3+3+3 = 9ohm

Now, this 9 ohm is parallel with the other remaining 3 ohm resistor.

So, equivalent resistance, Rnet = 9 || 3 = 9*3/(9+3) = 2.25 ohm <---- option B

4)

The magnetic force always acts perpendicular to the direction of motion of the proton as given by the equation:

F = q(v (cross) B)

where v (cross) B is the vector product of v and B and the resultant is perpendicular to both v and B

So, there is no change in speed of the proton.

But there is change in direction

So, answer is B) Only direction changes

5)

All statements are true except the option (C) The demonstration was capable of launching an aluminium ring with magnetic fields.

So, answer is D ) <--------answer

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