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Two coils: emf in one from the other's rate of change of current, then flux linked when a current flows

The same question, asked 3 times: 3 May 2023 S2*, 21 Apr 2025 S1*, 26 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    29
    Two coils are kept near each other. When no current passes through first coil and current in the 2nd coil increases at the rate 10 A/s, the e.m.f. in the 1st coil is 20 mV. When no current passes through 2nd coil and 3.6 A current passes through 1st coil the flux linkage in coil 2 is

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  2. Question 2

    21 Apr 2025 S1

    8
    Two coils P and Q are kept near each other. When no current flows through coil P and current increases in coil Q at the rate of 10 A/s10\text{ }A/s, the e.m.f. in coil PP is 15mV15mV. When coil QQ carries no current and current of 1.8 A flows through coil P, the magnetic flux linked with coil Q is

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  3. Question 3

    26 Apr 2025 S2

    37
    Two coils PP and QQ are kept near each other. When no current flows through coil P and current increases in coil Q at the rate 10 A/s10\,A/s, the emf in coil PP is 12 mV. When coil QQ carries no current and current of 1.5 A flows through coil P, the magnetic flux linked with the coil Q in mWb is

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