Two small bar magnets are placed in a line at certain distance d apart. If the length of each magnet is negligible compared to d, the force between them will be inversely proportional to

Question

Two small bar magnets are placed in a line at certain distance d apart. If the length of each magnet is negligible compared to d, the force between them will be inversely proportional to (A) d2 (B) d (C) d3 (D) d4

Tardigrade Admin · Accepted Answer

F propto (μ0/4 π) (M1 M2/d4) so F propto (1/d4)

Q. Two small bar magnets are placed in a line at certain distance $d$ apart. If the length of each magnet is negligible compared to $d$ , the force between them will be inversely proportional to

$d^{2}$

$d$

$d^{3}$

$d^{4}$

$F \propto \frac{μ _{0}}{4 π} \frac{M _{1} M _{2}}{d ^{4}}$
so $F \propto \frac{1}{d ^{4}}$

Q. Two small bar magnets are placed in a line at certain distance d apart. If the length of each magnet is negligible compared to d, the force between them will be inversely proportional to

d2

d

d3

d4

F∝4πμ0​​d4M1​M2​​ so F∝d41​

Q. Two small bar magnets are placed in a line at certain distance $d$ apart. If the length of each magnet is negligible compared to $d$ , the force between them will be inversely proportional to

$d^{2}$

$d$

$d^{3}$

$d^{4}$

$F \propto \frac{μ _{0}}{4 π} \frac{M _{1} M _{2}}{d ^{4}}$
so $F \propto \frac{1}{d ^{4}}$