Question 21 : Which, among the following, is the correct expression for mutual inductance?
1. M=N2f2/I2
2. M=N2f2/I1
3. M=N1f2/I2
4. M=N1f1/I1
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Question 22 : What is the SI unit of mutual inductance?
1. Ohm
2. Henry
3. Volt
4. Siemens
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Question 23 : If the current in one coil is steady, what happens to the mutual inductance?
1. Zero
2. Infinity
3. Doubles
4. Halves
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Question 24 : If the current in one coil becomes steady, the current in neighbouring coil is?
1. Zero
2. Infinity
3. Doubles
4. Halves
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Question 25 : The phenomenon due to which there is an induced current in one coil due to the current in a neighbouring coil is?
1. Electromagnetism
2. Susceptance
3. Mutual inductance
4. Steady current
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Question 26 : Find the time taken for the current in an inductor to change to 2A from 0A if the power in the inductor is 5W. The value of inductance is 10H.
1. 1s
2. 2s
3. 3s
4. 4s
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Question 27 : Calculate the current in an inductor if the energy stored is 160J and the inductance is 20H.
1. 1A
2. 2A
3. 3A
4. 4A
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Question 28 : Calculate the value of emf in an inductor if the value of inductance is 15H and an average current of 5A flows through it in 10s.
1. 15V
2. 7.5V
3. 10V
4. 5.5V
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Question 29 : Calculate the emf induced in an inductor if the inductance is 10H and the current is 2A in 4s.
1. 2.5V
2. 1.5V
3. 3.5V
4. 5V
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Question 30 : Calculate the value of stored energy in an inductor if the value of inductance is 20H and 4A of current flows through it.
1. 220J
2. 150J
3. 190J
4. 160J
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