An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards

Options

A. north
B. east
C. west
D. downwards

Answer

To determine the direction of the magnetic field vector of an electromagnetic wave propagating north with its electric field vector pointing upwards, we can use the right-hand rule. Here’s a step-by-step solution:

### Step 1: Identify the Direction of Propagation
The electromagnetic wave is propagating in the north direction.

**Hint:** Visualize the wave's direction as a straight line pointing towards the north.

### Step 2: Identify the Direction of the Electric Field
The electric field vector is directed upwards.

**Hint:** Picture the electric field as an arrow pointing straight up from the ground.

### Step 3: Apply the Right-Hand Rule
To find the direction of the magnetic field vector, we can use the right-hand rule.

1. Point your thumb in the direction of the wave propagation (north).
2. Point your index finger in the direction of the electric field (upwards).
3. Your middle finger, which is perpendicular to both your thumb and index finger, will point in the direction of the magnetic field.

**Hint:** Remember that your thumb represents the direction of wave propagation, your index finger represents the electric field, and your middle finger will give you the direction of the magnetic field.

### Step 4: Determine the Direction of the Magnetic Field
Using the right-hand rule, if your thumb is pointing north and your index finger is pointing upwards, your middle finger will point towards the east.

**Hint:** Visualize your hand in 3D space to see how the fingers align.

### Conclusion
The magnetic field vector of the electromagnetic wave will point towards the east.

**Final Answer:** East