If coil is open then L and R become

If coil is opened, then L and R become

When the number of turns in a coil is doubled without any change in the length of coil its selfinductance becomes ________ .

Assertion (A): If the number of turns of a coil is increased, it becomes more difficult to push a bar magnet towards the coil. Reason (R): The difficulty faced is according to Lenz's law.

When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance becomes

When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved , the magnetic field at its centre will become