## A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?

A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?

A. 4 volt
B. 5 volt
C. 2 volt
D. 0.4 volt

## Heating a magnet will ____________________?

Heating a magnet will ____________________?

A. weaken it
B. strengthen it
C. reverse its polarity
D. demagnetize it completely

## Galvanometer is a very sensitive device with______________________?

Galvanometer is a very sensitive device with______________________?

A. very low damg
B. very high damg
C. no damg at all

## When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

A. a straight line parallel to the field
B. a parabola in a plane perpendicular to the field
C. a circle in a plane perpendicular to the field
D. a straight line along its initial direction

## The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?

The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?

A. use a very long and fine suspension
B. use a coil of very large area
C. use a coil with very large number of turns
D. use a very strong magnetic field

## An ammeter measures the total current flowing through a circuit when it is connected__________________?

An ammeter measures the total current flowing through a circuit when it is connected__________________?

A. in series with the circuit
B. in parallel with circuit
C. in series with any of the parallel resistances in the circuit
D. in parallel with any of the series resistances in the circuit

## While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?

While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?

A. a most sensitive galvanometer is used
B. a steady voltage cell is used
C. the balance point is close to the middle of the wire
D. a high resistance box is used in one of its gap

## Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?

Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?

A. 0.1 A
B. 1:00 AM
C. current sensitivity
D. 1 m A

## The sensitivity of a galvanometer is given by__________________?

The sensitivity of a galvanometer is given by__________________?

A. C/BAN
B. CAN/B
C. BAN/C
D. ABC/N

## The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?

The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?

A. 18Ω
B. 30Ω
C. 24Ω
D. 12Ω