Question

Observe the following diagram and choose the correct alternative

Answer 1

the answer is (D) option

because it is in parallel

Answer 2

Answer:

The answer is A :

The intensity of the magnetic field in A is larger than in B.

Explanation:

This is a question on electromagnetism.

The strength of an electromagnet depends on the following factors :

1) The number of turns on the current carrying conductor.

2) The amount of current flowing through the conductor.

In a parallel arrangement the effective resistance is at its maximum since :

Re(effective current) = R1 + R2

I = V/R

I = current in amperes

V = potential difference in volts

R = resistance in ohms

As for the resistors in series the effective resistance is given by :

1/Re(effective resistance) = 1/R1 + 1/R2

We see the series arrangement gives a lower resistance.

Therefore for an equal amount of voltage the series arrangement gives the highest amount of current.

In this case it forms the arrangement with the strongest magnetic field.

The correct answer is thus A.