Question

Please solve this question (Ntse stage-2 question)

Answer 1

Answer:

Option A.

Explanation:

B is magnetic field.

B=mu not × I ÷ 2 × r

B= 4 × pi × 10^-7 ×2 ÷ 2 × 8 × 10^-2

B = 12.56 × 10^-7 ÷ 8 × 10^-2

B = 1.57 × 10^-5 T.

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Answer 2

Answer:

option A

Explanation:

I= 2A

R = 8cm =8×10^-2 m

magnetic field at centre is given by

4pie ×10^-7 / 2×8×10^-2

= 8×3.14× 10^-5 / 2×8

= 3.14 ×10^-5/ 2

= 1.5 × 10^-5 T