Question

After analysing the graph a student writes the following statements.

I. The magnetic field produced by the solenoid is inversely proportional to the

current.

II. The magnetic field produced by the solenoid is directly proportional to the

current.

III. The magnetic field produced by the solenoid is directly proportional to square

of the current.

IV. The magnetic field produced by the solenoid is independent of the current.

Choose from the following which of the following would be the correct statement(s).

a. Only IV

b. I and III and IV

c. I and II

d. Only II​

Answer 1

Answer:

The magnetic field produced by the solenoid is directly proportional to the current. So option D is correct.

Explanation:

Solenoid : A solenoid is a coiled wire ,when electric current passes through it , a magnetic field is induced in the coil. Its working principle is based on electromagnetism. The intensity of magnetic field produced in the coil can be augmented by increasing the current passing through the coil or by increasing the number of turns in the coil.

The magnetic field produced in the solenoid is given by formula as:

                                B = μ₀ (NI/l)

From the above formula, it is clear that Magnetic field is directly proportional to the current I. So option D is correct.