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 solve the problem, we need to determine the direction of the magnetic field vector of an electromagnetic wave that is propagating north with its electric field vector pointing upwards.

### Step-by-step Solution:

1. **Identify the Direction of Propagation**:
- The electromagnetic wave is propagating along the north direction. We can denote this direction as the positive y-axis.

2. **Identify the Direction of the Electric Field Vector**:
- The electric field vector is given to be pointing upwards. We can denote this direction as the positive z-axis.

3. **Use the Right-Hand Rule**:
- To find the direction of the magnetic field vector, we can use the right-hand rule. According to this rule, if you point your thumb in the direction of the propagation of the wave (north), and your index finger in the direction of the electric field (upwards), your middle finger will point in the direction of the magnetic field vector.

4. **Determine the Direction of the Magnetic Field Vector**:
- With your thumb pointing north (positive y-axis) and your index finger pointing upwards (positive z-axis), your middle finger will point towards the east (positive x-axis).

5. **Conclusion**:
- Therefore, the magnetic field vector points towards the east.

### Final Answer:
The magnetic field vector points towards the east.

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