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Question: The magnetic moment produced in a substance of ![](https://cdn.pureessence.tech/canvas_162.png?top_l...

The magnetic moment produced in a substance of is 6×10−76 \times 10 ^ { - 7 } ampere - metre 2{ } ^ { 2 } If its density is then the intensity of magnetisation in A/m will be

A

8.3×1068.3 \times 10 ^ { 6 }

B

3.0

C

1.2×10−71.2 \times 10 ^ { - 7 }

D

3×10−63 \times 10 ^ { - 6 }

Answer

3.0

Explanation

Solution

10−3 kg10 ^ { - 3 } \mathrm {~kg}, and

density =5gm/cm3=5×10−3 kg(10−2)3 m3=5×103 kg/m35 \mathrm { gm } / \mathrm { cm } ^ { 3 } = \frac { 5 \times 10 ^ { - 3 } \mathrm {~kg} } { \left( 10 ^ { - 2 } \right) ^ { 3 } \mathrm {~m} ^ { 3 } } = 5 \times 10 ^ { 3 } \mathrm {~kg} / \mathrm { m } ^ { 3 }Hence I=6×10−7×5×10310−3=3I = \frac { 6 \times 10 ^ { - 7 } \times 5 \times 10 ^ { 3 } } { 10 ^ { - 3 } } = 3