EBK PHYSICS FOR SCIENTISTS AND ENGINEER
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
6th Edition
ISBN: 9781319321710
Author: Mosca
Publisher: VST
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Chapter 21, Problem 14P

(a)

To determine

The position x1 and x2 in terms of a .

(a)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The electric field is the region near the charge where the other object or body will experience the force. The field lines are away from the positive charge and go towards the negative charge.

Draw the representation of the position of the three charges.

  EBK PHYSICS FOR SCIENTISTS AND ENGINEER, Chapter 21, Problem 14P

Write the expression for the Pythagoras theorem to the above triangle.

  x22+x2=a2

Here, x2 is the distance from the point 0 to the charge q2 and x1 is the distance between the point 0 to the third charge q3 .

Substitute 12a for x in the above equation.

  x22+(12a)2=a2

Solve the above equation for x2 .

  x2=32a

Write the expression for the angle.

  tanθ=x1x

Substitute 30° for θ and 12a for x in the above equation.

  tan30°=x112a

Solve the above equation for x1 .

  x1=a23

Conclusion:

Thus, the value ofposition x1 and x2 in terms of a are a23 and 32a respectively.

(b)

To determine

The electric field.

(b)

Expert Solution
Check Mark

Explanation of Solution

Introduction:

The electric field is the region near the charge where the other object or body will experience the force. The field lines are away from the positive charge and go towards the negative charge.

Write the expression for the net electric field at point P .

  EP=E2+E3+E4   ........ (2)

Here, E2 is the electric field due to the charge q2 , E3 is the electric field due to the charge q3 and E4 is the electric field due to the fourth charge.

Write the expression for the electric field due to the second charge.

  E2=kq2r2,p3r^2,p

Here, r2.p is the distance between the point p and the charge q2 .

Substitute x2x for r2.p in the above equation.

  E2=kq2(32ax)3(x32a)i^E2=kq(32ax)2i^

Write the expression for the electric field due to the third charge.

  E3=kq3r3,p3r^3,p

Here, r3.p is the distance between the point p and the charge q3 .

Substitute x2+14a2 for r3,p in the above equation.

  E3=kq3(x2+14a2)32(xi^12aj^)

Write the expression for the electric field due to the third charge.

  E4=kq4r4,p3r^4,p

Here, r4.p is the distance between the point p and the charge q4 .

Substitute x2+14a2 for r4,p in the above equation.

  E4=kq4(x2+14a2)32(xi^+12aj^)

Substitute kq(32ax)2i^ for E2 , kq3(x2+14a2)32(xi^12aj^) for and kq4(x2+14a2)32(xi^+12aj^) for E4 in equation (2).

  EP=kq(32ax)2i^+kq3(x2+14a2)32(xi^12aj^)+kq4(x2+14a2)32(xi^+12aj^)EP=kq(1(32ax)2+2x(x2+a24)32)i^

Conclusion:

Thus, the value of electric field is kq(1(32ax)2+2x(x2+a24)32)i^ .

(c)

To determine

The electric field is same at x=0 and x=x1 .

(c)

Expert Solution
Check Mark

Explanation of Solution

Formula used:

Write the expression for the electric field at point P .

  EP=kq(1(32ax)2+2x(x2+a24)32)i^   ........ (4)

Calculation:

Substitute 0 for x in equation (4).

  EP=kq(32ax)2i^

Substitute 36a for x1 in equation (4).

  EP=kq(1(32ax)2+236a(x2+a24)32)i^EP=kq(3a2+3a2)i^EP=0

Conclusion:

Thus, the electric field is zero.

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Chapter 21 Solutions

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