When a bar magnet is placed inside a uniform magnetic field, it experiences both a force and a torque.

Option 1: A force - This is correct because when a magnet is placed in a magnetic field, it interacts with the field and experiences a force that can either attract or repel it. The force exerted on the magnet depends on its orientation relative to the magnetic field.

Option 2: A torque - This is also correct because a torque is a twisting or rotating force. When a magnet is placed in a magnetic field, the magnetic torque acts on it and tries to align it with the magnetic field. The magnet will experience a twisting force that tends to align it parallel or anti-parallel to the magnetic field.

Option 3: Both a force and a torque - This is the correct answer because, as explained above, a bar magnet experiences both a force and a torque when placed inside a uniform magnetic field.

Option 4: Neither a force nor a torque - This is not correct as the magnet does experience both a force and a torque when placed in a magnetic field.

In summary, when a bar magnet is placed in a uniform magnetic field, it experiences both a force and a torque.