A compass needle just above a wire in which electrons are moving towards east, will point

Options

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

Answer

To solve the question of which direction a compass needle will point when placed just above a wire carrying electrons moving towards the east, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Direction of Electron Flow**:
- The problem states that electrons are moving towards the east.

2. **Determine the Direction of Conventional Current**:
- Remember that conventional current flows in the opposite direction to the flow of electrons. Therefore, if electrons are moving east, the conventional current will be moving towards the west.

3. **Apply the Right-Hand Thumb Rule**:
- The Right-Hand Thumb Rule helps us determine the direction of the magnetic field created by a current-carrying conductor.
- According to this rule, if you point your right thumb in the direction of the conventional current (which is west in this case), your curled fingers will indicate the direction of the magnetic field lines.

4. **Visualize the Magnetic Field Direction**:
- If you point your right thumb to the west, your fingers will curl around the wire. Above the wire (where the compass is placed), the direction of the magnetic field will be directed towards the north.

5. **Determine the Compass Needle Direction**:
- A compass needle aligns itself with the magnetic field. Since the magnetic field above the wire is directed towards the north, the compass needle will point towards the north.

### Final Answer:
The compass needle just above the wire in which electrons are moving towards the east will point towards the north.

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