- Adecreasing N
- Bincreasing N
- Cwinding the coil on wooden frame
- Dwinding the coil on china clay
Explanation:
$\text{M}=\mu\text{N}_1\text{N}_2\frac{\text{Area}_{12}}{\text{length}_{12}}$
Area12 - area in common to both the coils where the flux links both of them together.
length12 - length in common to both the coils where the flux links both of them together.
Therefore to increase the mutual inductance, the number of turns can be increased.
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When a slab of dielectric material is introduced between the parallel plates of a capacitor which remains connected to a battery, then charge on plates relative to earlier charge
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(a) Is less |
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(b) Is same |
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(c) Is more |
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(d) May be less or more depending on the nature of the material introduced |
The output of a NAND gate is 0
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(a) If both inputs are 0 |
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(b) If one input is 0 and the other input is 1 |
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(c) If both inputs are 1 |
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(d) Either if both inputs are 1 or if one of the inputs is 1 and the other 0 |
Two capacitors of 3pF and 6pF are connected in series and a potential difference of 5000 V is applied across the combination. They are then disconnected and reconnected in parallel. The potential between the plates is
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(a) 2250 V |
(b) 2222 V |
(c) 2.25 |
(d) 1.1 |
Assertion : Isobars are the element having same mass number but different atomic number.
Reason : Neutrons and protons are present inside nucleus.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5
after 2 hours. The initial count rate was
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(a) 25 |
(b) 80 |
(c) 625 |
(d) 20 |