What does a Hadamard gate do to a qubit?

Question: What is the effect of applying a Hadamard gate H to a qubit initially in state |0⟩? A) It flips the qubit from |0⟩ to |1⟩ B) It creates an equal superposition of |0⟩ and |1⟩ C) It measures the qubit immediately D) It entangles the qubit with another qubit Correct: B Explanation: The Hadamard gate transforms |0⟩ into an equal superposition state, written as (|0⟩ + |1⟩)/√2. If this qubit is measured, the result is 0 or 1 with equal probability. This is one of the most basic ways to introduce quantum parallelism in a circuit. Topic: quantum computing / gates / superposition