An electron beam is moving horizontally towards east. If this beam passes through a uniform magnetic field directed upwards, then in which direction will the beam be deflected?

Explanation

To determine the direction in which the electron beam will be deflected when it passes through a uniform magnetic field, we can use the right-hand rule and the properties of charged particles in magnetic fields. Here’s the step-by-step solution:

### Step 1: Identify the Directions
- The electron beam is moving horizontally towards the east. We can represent this direction as the positive x-axis.
- The magnetic field is directed upwards, which we can represent as the positive z-axis.

### Step 2: Determine the Charge of the Electron
- An electron has a negative charge (−e). This is important because the direction of the force on a charged particle in a magnetic field depends on the sign of the charge.
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