Question 31 : Force in a conductor is__________ to the product of the charges.
1. Directly proportional
2. Inversely proportional
3. Not related
4. Cannot be determined
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Question 32 : What is the expression for force in a current carrying conductor?
1. F=K/r²
2. F=Kq/r²
3. F=Kq₁q₂/r²
4. F=Kq₁q₂/r
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Question 33 : The magnetic field of the solenoid is 18.84mT, the current is 30A. Calculate the number of turns per unit length if the core is air.
1. 1500 turns/m
2. 1000 turns/m
3. 500 turns /m
4. 2000 turns/m
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Question 34 : The magnetic field of the solenoid is 18.84mT, the number of turns per unit length is 500 turns per metre. Calculate the current if the core is air.
1. 300A
2. 30A
3. 3A
4. 300mA
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Question 35 : The current in a solenoid is 30A, the number of turns per unit length is 500 turns per metre. Calculate the magnetic field if the core is air.
1. 18.84T
2. 18.84mT
3. 1.84T
4. 1.84mT
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Question 36 : What happens to the magnetic field in the solenoid when the length of the solenoid increases?
1. Increases
2. Decreases
3. Remains constant
4. Becomes zero
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Question 37 : What happens to the magnetic field in the solenoid when the current increases?
1. Increases
2. Decreases
3. Remains constant
4. Becomes zero
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Question 38 : What happens to the magnetic field in the solenoid when the number of turns increases?
1. Increases
2. Decreases
3. Remains constant
4. Becomes zero
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Question 39 : What is the formula for the magnetic field due to a solenoid?
1. µnI
2. µn²
3. µNI
4. µN²I²
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Question 40 : If a coil is wound around a steel core and electric current is passed through the coil, the steel core acts as a?
1. Electromagnet
2. Permanent magnet
3. Neither electromagnet nor permanent magnet
4. Either electromagnet or permanent magnet
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