Question

In the given figures, there are four electromagnets. Which electromagnets are stronger?
A.

B.

C.

D.

Answer 1

Hint: Here we have asked to analyze the option and say which one will produce strong electromagnets. The strength of electromagnet depends on their number of turns, strength of current and the core the core is made of up which is a magnetic material. Soft magnetic core is best for electromagnet strength.

Complete step by step answer:
Electromagnet is a device that consists of a core of magnetic material that is surrounded by a coil through which an electric current is passed to magnetize the core. As per the problem the figure is given to us, with four electromagnets from that we need to tell which figure produces more electromagnet.

We know the strength of an electromagnet depends on three numbers of turns, strength of current and the core the core is made of up which is a magnetic material.Now if we see the options the option (A) satisfy all the condition and it also have a soft iron placed inside the coils while other have turns and current flowing through the coil but if we compare all the four condition only the first one has the soft iron and it plays the main role in strengthening the electromagnet. The soft iron increases the magnetic field lines and due to which electromagnet becomes stronger.

Therefore, the correct answer is option A.

Note: Remember that using the concept of Faraday’s law and Lenz’s law we can solve this type of electromagnetic strength problem. Note that these two laws tell us about two important things, changing magnetic field interactions with a loop of conductor. Both laws state different working conditions.