A solenoid exerts a force of attraction on an iron plate when a current flow through it. This fo...

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A solenoid exerts a force of attraction on an iron plate when a current flow through it. This force can be increased by
(A) Putting an iron core in the solenoid
(B) Cooling the solenoid to reduce the resistance of the coil
(C) Increasing the current flow through the coil
(D) All of the above
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