Question

Factors affecting the strength of electromagnet

• A. the number of turns in the coil
• B. the current flowing in the coil
• C. the length if air gap between the poles.
• D. all

Answer 1

The correct option is D all

we know that

$\overrightarrow{B}=\frac{\mu NI}{L}$ where,

$\overrightarrow{B}$= Magnetic strength

N= number of turns

I= Current

L= Length of coil gap.