4. a) will the compass needle show deflection when the switch in the circuit is closed.
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Electric Current and its Effect CBSE Science Class 7 Chapter ... Ans: The compass needle will not show any deflection when the switch in the circuit shown by above figure is closed, because there is no power source like cells in the circuit hence there will be no electric current flow in the circuit.
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No , compass needle does not show deflection when the circuit is a closed, magnetic field is not created until current is flowing through the circuit.
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