Magnet

Assets/Scripts/Magnet.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Magnet : MonoBehaviour
+{
+    Rigidbody _rb;
+    Rigidbody rb { get { if (!_rb) _rb = GetComponent<Rigidbody>(); return _rb; } }
+
+    public float strength = 100;
+
+    private void OnTriggerStay(Collider other)
+    {
+        var otherRb = other.attachedRigidbody;
+
+        if(otherRb)
+        {
+            Vector3 dir = otherRb.position - rb.position;
+            float dirSq = Vector3.SqrMagnitude(dir);
+            float force = strength * (1.0f / dirSq);
+
+            otherRb.AddForce(-dir * force);
+            rb.AddForce(dir * force);
+        }
+    }
+}

Assets/Scripts/Magnet.cs.meta

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