AP EAMCET Engineering 21 Sep 2020 Shift 2 Paper

(b) Charge on helium nucleus,
q=+2e=2×1.6×10−19C=3.2×10−19C
Radius of helium nucleus, r=0.8m
Time period, T=2s
∴ Current associated with helium nucleus,
I=‌

q

T

=‌

3.2×10−19

2

=1.6×10−19A
∴ Magnetic field at the centre of the loop,
B=‌

µ0I

2r

=‌

µ0×1.6×10−19

2×0.8

=µ0×10−19T