The coercivity of a magnet is 3×103Am−1. What current should be passed through a solenoid of length 10cm and number of turns 50 that the magnet is demagnetized when inserted in it?
A
3A
B
6A
C
9A
D
12A
Hard
Open in App
Updated on : 2022-09-05
Solution
Verified by Toppr
Correct option is B)
Length of solenoid L=10cm=0.1m Number of turns N=50 So, number of turns per unit length n=LN=0.150=500 Current to be passed i=nH ⟹i=5003×103=6A