# Calculus 3 : Divergence

## Example Questions

### Example Question #27 : Line Integrals

Find the divergence of the force field

Explanation:

The correct formula for divergence is   .

Remember that the result of a divergence calculation must be a scalar, not a vector.

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### Example Question #28 : Line Integrals

Evaluate the divergence of the force field

Explanation:

The correct formula for divergence is   .

Remember that the result of a divergence calculation must be a scalar, not a vector.

.

### Example Question #29 : Line Integrals

Find the divergence of the force field .

Explanation:

The correct formula for divergence is   .

Remember that the result of a divergence calculation must be a scalar, not a vector.

.

### Example Question #30 : Line Integrals

Find the divergence of the force field .

Explanation:

The correct formula for divergence is   .

Remember that the result of a divergence calculation must be a scalar, not a vector.

.

### Example Question #21 : Divergence

Find the divergence of the vector

Explanation:

To find the divergence of a vector , we apply the following definition: . Applying the definition to the vector from the problem statement, we get

### Example Question #22 : Divergence

Find , where F is given by

Explanation:

The divergence of a vector is given by

, where

Taking the partial respective partial derivatives of the x, y, and z components of our curve, we get

The rules used to find the derivatives are as follows:

### Example Question #23 : Divergence

Calculate the divergence of the following vector:

Explanation:

For a given vector

The divergence is calculated by:

For our vector

### Example Question #24 : Divergence

Given that F is a vector function and is a scalar function, which of the following operations results in a vector?

Explanation:

- The curl of a vector is also a vector, so the divergence of the term in parenthesis is scalar.

- The divergence of a vector is a scalar.  The divergence of a scalar is undefined, so this expression is undefined.

- The gradient of a scalar is a vector, so the divergence of the term in parenthesis is a scalar.

- The divergence of a scalar doesn't exist, so this expression is undefined.

- The curl of a vector is also a vector, so the curl of the term in parenthesis is a vector as well.

### Example Question #25 : Divergence

Given that F is a vector function and f is a scalar function, which of the following expressions is valid?

Explanation:

For each of the given answers:

- The curl of a scalar is undefined, so the term in parenthesis is invalid.

- The divergence of a scalar is also undefined, so the term in parenthesis is invalid.

- The gradient of a scalar is undefined as well, so the term in parenthesis is invalid.

- The divergence of a vector is a scalar.  The divergence of a the term in parenthesis, which is a scalar, is undefined, so the expression is invalid.

The remaining answer must be correct:

- The gradient of a scalar is a vector, so the divergence of the term in parenthesis is a scalar.  The expression is valid.

### Example Question #26 : Divergence

Compute the divergence of the following vector function: