Question

Sully uses a battery and a coil of wire to create an electromagnet. Using the same materials, if he wants to increase the strength of his electromagnet, he must _____ the number of loops in the coil of wire along its length. If he uses an additional battery, the strength of his electromagnet will _______.
first blank has options: increase, decrease, no change

second blank has the same options

Answer 1

Answer : The correct answer for both the fill in the blank is, increases.

Explanation :

Formula used :

1) $B=\mu_o\times \frac{N\times I}{L}$

B = strength of magnetic filed

N = Number of loops

I = current in the wire

$\mu_o$ =  magnetic permeability

$B\propto N$

The more the number of loops in the solenoid more will the strength of three magnetic fields.

2) Also according to Ohm's law:

Voltage is directly proportional to current:

$V\propto I$

With increase in voltage the the current will increase which in return increase the magnetic field in the solenoid.

So, the correct answer for both the fill in the blank is, increases.

Answer 2

Answer is increase for both.