Pls help me answer all these series of questions 1. Which of the following state
ID: 1401746 • Letter: P
Question
Pls help me answer all these series of questions
1. Which of the following statements are true?
True False The force on a moving charge is perpendicular to both the field and its velocity.
True False The larger the charge of a moving particle, the more it will speed up inside of a magnetic field.
True False When placing a dipole magnet into a magnetic field, it will be accelerated perpendicular to the field lines.
True False Magnetic field lines always start at a North and end at a South pole
2.ou know you should not have bought the "MRI in a Box" kit from the Home Shopping Channel. Its main solenoid is supposed to have a radius of r=0.12 m, a length of L=0.15 m, and 12000 windings. The wire they give you has a resistance of 13 m per meter. With only air inside, it's supposed to generate a field of 6.4 Tesla. What current would be needed?
How much power would your MRI device consume in steady operation?
If the field is an electric field, and the charge is moving into the screen, what is the direction of the force?
North
East
South
West
Into the screen
Out of the screen
Zero
4.If the field is a magnetic field, and the charge is moving into the screen, what is the direction of the force?
North
East
South
West
Into the screen
Out of the screen
Zero
Explanation / Answer
1) F = q*(v X B)
From this formula
The force on a moving charge is perpendicular to both the field and its velocity is True
apply q*B = m*v/r
cherge q is proportional to the speed of the particle
hence The larger the charge of a moving particle, the more it will speed up inside of a magnetic field. is TRUE
When placing a dipole magnet into a magnetic field, it will be accelerated perpendicular to the field lines. TRUE
Magnetic field lines always start at a North and end at a South pole TRUE
2) B = mu_0*n*I
6.4 T = (4*3.142*10^-7*12000/0.15)*I
Current I = 6.4/0.100544 = 63.65 A
Power consumed is P = i^2*R = 63.65^2*13*10^-3*0.15 = 7.9 W
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3) if charge is positive the Force is in the direction of the electric field....into the screen
if charge is negative then the force is in the direction of the opposite to the field...out of the screen
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4) Not possible to find out the force without knowing the direction of the filed
the direction of force is perpendicular to both magnetic filed and speed of the particle