First slide

Applications involving charged particles moving in a magnetic field

Question

A tangent galvanometer shows no deflection when a current is passed through it, but when the current through it is reversed it gives a deflection of $180^{0}$ , then the plane of the coil

Easy

A

in the magnetic meridian
B

normal to the magnetic meridian
C

at an angle $45^{0}$ to magnetic meridian
D

at an angle $15^{0}$ to magnetic meridian

Solution

Initially, when coil is perpendicular to magnetic meridian, the field produced by coil is in opposite direction to the Earth's magnetic field ( $B_{H}$ ).
Finally , when direction of current is reversed, the field produced by coil is also reversed and adds up with Earth's magnetic field ( $B_{H}$ ) , to give deflection of $180^{o}$ .

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