Which one of the following statements regarding a current-carrying solenoid is not correct?

Which one of the following statements is NOT correct ?

Which one of the following statements is not correct?

Which one of the following statements regarding magnetic field is NOT correct ?

With reference to the electric potential which of the following statements is incorrect?

Of the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct?