Physics: for Science.. With Modern. -Update (Looseleaf)
Physics: for Science.. With Modern. -Update (Looseleaf)
9th Edition
ISBN: 9781305864566
Author: SERWAY
Publisher: CENGAGE L
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Chapter 23, Problem 35P

(a)

To determine

The vector electric field created by the 6.00nC and 3.00nC charges together at the origin.

(a)

Expert Solution
Check Mark

Answer to Problem 35P

The vector electric field that the 6.00nC and 3.00nC charges together create at the origin is [0.599i^2.70j^]kN/C.

Explanation of Solution

The following figure represents the forces acting on the charges.

Physics: for Science.. With Modern. -Update (Looseleaf), Chapter 23, Problem 35P

Figure-(1)

Here, F1 is the electric force acting on the charge of 5.00nC by the charge of 6.00nC and F2 is the electric force acting on the charge 5.00nC by the charge 3.00nC.

Write the expression for the electric field at origin by the charge q1 in the negative x axis.

    E1=kq1r12(i^)

Here, E1 is the electric field at origin by the charge q1, r1 is the distance of the charge q1 from the origin, k is the electrostatic constant. The negative sign indicates that the electric field is in negative x axis direction.

Write the constant value for the Coulomb constant k.

    k=8.9876 ×109N.m2/C2

Write the expression for the electric field at origin by the charge q2 in the negative y axis.

    E2=kq2r22(j^)

Here, E2 is the electric field at origin by the charge q2, r2 is the distance of the charge q2 from the origin, k is the electrostatic constant. The negative sign indicates that the electric field is in negative y axis direction.

Write the expression for the total vector electric field at origin by the charges q1 and q2.

    E=E1+E2                                                                                                                (I)

Here, the E1 is the electric field at origin by the charge q1 and E2 is the electric field at origin by the charge q2.

Write the expression to convert the units for charge q1 from nC to C.

    q1=6.00nC                                                                                                             (II)

Write the expression to convert the units for charge q2 from nC to C.

    q2=|3.00nC|                                                                                                        (III)

Substitute kq1r12(i^) for E1 and kq2r22(j^) for E2 in the equation (I) to calculate E.

    E=kq1r12(i^)+kq2r22(j^)                                                                                           (IV)

Conclusion:

Convert the units for the charge q1 from nC to C in equation (II).

    q1=6.00nC(1C1×109nC)=6.00×109C

Convert the units for the charge q2 from nC to C in equation (III).

    q2=3.00nC(1C1×109nC)=3.00×109C

Substitute 6.00×109C for q1, 3.00×109C for q2, 0.300m for r1 and 0.100m for r2 and 8.9876×109Nm2/C2 for k in equation (IV) to solve E.

    E=[(8.9876×109Nm2/C2)(6.00×109C)(0.300m)2(i^)+(8.9876×109Nm2/C2)(3.00×109C)(0.100m)2(j^)]=[599.17(i^)+2696.28(j^)]N/C=[0.599×103(i^)+2.70×103(j^)]N/C

Further simplify the above equation.

    E=[0.599×103i^2.70×103j^]N/C=[0.599×103i^2.70×103j^]N/C(103kN/C1N/C)=[0.599i^2.70j^]kN/C

Therefore, the vector electric field that the 6.00nC and 3.00nC charges together create at the origin is [0.599i^2.70j^]kN/C.

(b)

To determine

The vector force on the 5.00nC charge.

(b)

Expert Solution
Check Mark

Answer to Problem 35P

The vector force on the 5.00nC charge is (3.00i^13.5j^)μN.

Explanation of Solution

Write the expression for the relation between the electric force and the electric field.

    F=qE                                                                                                                   (IV)

Here, q is the charge on the origin, E is the electric field at the origin due to the charges 6.00nC and 3.00nC.

Write the expression to convert the units for charge q1 from nC to C.

    q=5.00nC                                                                                                              (V)

Conclusion:

Convert the units for the charge q from nC to C in equation (V).

    q=5.00nC(1C1×109nC)=5.00×109C

Substitute 5.00×109C for q and [0.599i^2.70j^]×103N/C for E in equation (IV) to calculate F.

    F=5.00×109C×[0.599i^2.70j^]×103N/C=[(5.00×109)×(0.599i^)(5.00×109C)×(2.70j^)]×103N=[(2.99i^13.48j^)×106N](1μN1×106N)(3.00i^13.5j^)μN

Therefore, the vector force on the 5.00nC charge is (3.00i^13.5j^)μN.

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Chapter 23 Solutions

Physics: for Science.. With Modern. -Update (Looseleaf)

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