Question

1. A force of 5.78x10-16 N acts on an unknown particle that travels at a 90 ° angle through a magnetic field. the velocity of the particle is 5.65x104 m / s and the field is 3.20x10–2 T, how many elementary charges does the particle carry?

2.What potential must be applied to a source of mass ions (9.99x1027 kg) to be accelerated by a region where there is a 1.2 T perpendicular magnetic field, if the minimum electric field to keep the ions in a straight line is 6.5x108 V / m

3.A loop of wire carrying current is in the plane of this page. Outside the loop, its magnetic field points to the page. What is the direction of the current in the loop?

a) clockwise

b) counterclockwise

c) off screen

d) the magnetic field inside the loop is zero

(answer by choosing from the alternatives, a, b, c, d)

4.An electron moves through the Earth's equator at a speed of 2.5x106 m / s and in a direction of 35 ° N from E. At this point, the Earth's magnetic field has a northward direction, it is parallel to the surface and has a magnitude of 0.10x10-4 T. What is the force acting on the electron due to its interaction with the Earth's magnetic field?

5.Two straight conductors are separated by a distance of 0.75 cm. If the first wire carries a current of 6.5 A towards the page, and the magnetic field of the two currents at a point P at 1.5 cm is zero, what current and direction must the second lead wire have for this to occur. Clarification (apart from the magnitude and the unit should say the direction of the current)

6.Suppose you are a researcher at the European Organization for Nuclear Research (CERN) which asks you to investigate the frequency of oscillation to accelerate deuterons. If the cyclotron used has a radius of 75 cm and the magnetic field established by the magnets is 1.5 T. What must this frequency of oscillation be to accelerate them? .

. If the answer has exponential, write as follows followed by its unit (0.000Eplus-or-minus value of the exponent that is)

7.What will be the maximum energy that these particles from problem 6 in the maximum radius (0.75 m2) in electron volts could obtain?

8.A proton moves vertically upward and perpendicular to a uniform magnetic field. It moves to the left as you watch it. What is the direction of the magnetic field?

(a) Moving away from you

(b) Directly towards you

(c) Right

(d) To the left

You must submit only the letter (a, b. C or d)

9.There are three solenoids. Solenoid "A" has a length L and N-turns, Solenoid "B" has a length of 2L and N turns, and Solenoid "C" has L / 2 and 2N turns. If each solenoid carries the same current, rank it according to the strength of the magnetic field in the center of each solenoid, from highest to lowest

10.A coil has 50 turns and 15 cm of radius and creates a magnetic field of 0.80 mT. Calculate the current going through the coil

Answer 1

1) F = 5.78 * 10^-16 N

v = 5.65 * 10^4 m/s

B = 3.2 *10^-2 T

Using, F= qVB

5.78 * 10^-16 = n * 1.6 * 10^-19 * 5.65 * 10^4 * 3.2 * 10^-2

n = 2

Therefore, elementary charges carried by the particle = 2

3) The magnetic field points to the page outside the loop , therefore current is moving in clockwise direction (according to right hand thumb rule).

4) F = qVbSin(theta)

F = 1.6*10^-19 * 2.5 * 10^6 * 0.1*10^-4 * Sin(90-35)

F = 3.6 * 10^ -18 N

10) B = N* $\mu_o$ I/2r

0.8 * 10^-3 = 50*4*3.14 *10^-7 * I /(2*0.15)

I = 3.82 A

Therefore, current through the loop is 3.82 A