Physics · Ampere's law and its applications to infinitely long current carrying straight wire and solenoid
The magnetic field generated along the axis of a solenoid is proportional to:
The magnetic field generated along the axis of a solenoid is proportional to:
- A. its length
- B. square of current flowing in it
- C. number of turns per unit length in it
- D. reciprocal of its radius
Step-by-step solution
The magnetic field inside a long solenoid is given by B = μ₀ n I, where n is the number of turns per unit length. Thus, B is directly proportional to n, and not to the solenoid's length, square of current, or reciprocal of its radius.
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