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A capacitor o...

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A capacitor of capacitance 100 micro farad is connected to a battery of 20V for a long time and then disconnected from it. it is now connected across a long solenoid having 4000 turns per metre it is found that the potential diffrence across the capacitor drops to 90% of its maximum value in 2 sec estimate the average magnetic field produced at the centre of the solenoid during this period

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A capacitor of capacitance $100 μ F$ is connected to a battery of 20 volts for a long time and then disconnected from it. It is now connected across a long solenoid having 4000 turns per metre. It is found that the potential difference across the capacitor drops to $90 %$ of its maximum value in 2.0 seconds. Estimate the average magnetic field produced at the centre of the solenoid during this period.

Q. A capacitor of capacitance

0.5 C

is connected to a battery of emf

20 V

for a long time and then disconnected. The charged capacitor is then connected across a long solenoid having

1000

metre

in its closely packed windings on its core. After connection, it is found that the voltage across the capacitor drops to

8 V

in a time interval of

2 s

. In this period, what is the average magnetic induction at the center of the solenoid.

Q. When current flows through a long solenoid having

1000

turns per metre, the magnetic field at its centre is found to be

2 π \times 10^{- 4} T

. What would be the resistance of the solenoid if it is connected across

6 V

Q. A long solenoid has 200 turns per cm and carries a current i.The magnetic field at its centre is

6.28 \times 10^{- 2} W b / m^{2}

. Another long solenoid has 100 turns per cm and it carries a current i/3.The value of magnetic field at its centre is:

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