The number of turns and the radius of the coil of a tangent galvanometer are doubled. The change factor K will be:
A
K
B
2K
C
4K
D
K/4
Correct Option:
A
Explanation
Reduction factor K = 2rBₕ/(μ₀N). Doubling both the radius r (2r) and the number of turns N (2N) leaves the ratio r/N identical (2r/2N = r/N), keeping K constant.
