Question

Magnetic field of earth is 0.3 gauss a magnet oscollating /min how much the magnetic field of the earth is increased so the number of oscillation become 10 per min

Answer 1

Answer:

The correct answer will be 0.9 gauss

Explanation:

According to the problem let the magnetic field of earth is B1

let the magnet is oscillating with a speed of ω1

ω1 = 1 oscillation/min it is given that ω2 = 10 oscillation/min

Now we know that

ω1^2/ω2^2 = B1^2/B2^2

by calculating this, we can get,

B2 = 1.26 gauss

Therefore the magnetic field has increased, B2 -B 1 = 1.26 -0.3 = 0.9 gauss