Moving Charges and Magnetism Test

Result

Moving Charges and Magnetism Test - 8

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Question 1
1 / -0

In a moving coil galvanometer the current through the coil produces a torque to turn the coil. The torque is balanced by

A
eddy current torque

B
gravitational torque

C
magnetic moment

D
a helical spring deflection

Solution

In a moving coil galvanometer, the coil is pivoted on a helical spring. When current passes through the coil, it experiences a torque and deflects. A restoring torque is set up in the helical spring which tries to restore the coil to its original position.
Question 2
1 / -0

For measuring microampere(μA) current, the galvanometer is

A
always connected in series

B
connected in parallel series

C
connected in series parallel

D
always connected in parallel

Solution

For measurement of current of any magnitude, the galvanometer is always connected in series. This is to ensure that the entire current flows through the galvanometer. If the galvanometer were connected in parallel, the current branches out and only a part of the current will flow through it.
Question 3
1 / -0

Shunt resistance is added to the galvanometer

A
In parallel to the galvanometer to raise the input resistance of the meter

B
In parallel to the galvanometer to lower the input resistance of the meter

C
In series to the galvanometer to lower the input resistance of the meter

D
In series to the galvanometer to raise the input resistance of the meter

Solution

A shunt resistance of magnitude less than that of the galvanometer is added in parallel to the galvanometer to convert it into an ammeter. The equivalent resistance of a parallel combination is always less than the least value of the resistances in parallel. Ammeters are connected in series to the circuit to allow the entire current of the circuit to pass through them. Its resistance has to be very less- almost negligible, so that it does add on to the resistance in the circuit, thereby changing the current.
Question 4
1 / -0

A current carrying wire produces in its neighbourhood

A
zero field

B
magnetic field only

C
electric field only

D
electric and magnetic fields

Solution

Static charges produce only an electric field. Moving charges produce a magnetic field in addition to their electric fields.