Q. No.A long solenoid has 800 turns per meter length of the solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is:
1.
2.
3.
4.
The unit of reduction factor of the tangent galvanometer is
(1) Ampere
(2) Gauss
(3) Radian
(4) None of these
In order to pass 10% of the main current through a moving coil galvanometer of 99 ohms, the resistance of the required shunt is :
(1) 9.9 Ω
(2) 10 Ω
(3) 11 Ω
(4) 9 Ω
When a \(12~\Omega\) resistor is connected in parallel with a moving coil galvanometer, its deflection reduces from \(50\) divisions to \(10\) divisions. What will be the resistance of the galvanometer?
1. \(24~\Omega\)
2. \(36~\Omega\)
3. \(48~\Omega\)
4. \(60~\Omega\)
A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is :
(1) nG
(2)
(3)
(4)
Which of the following statement is wrong:
(1) Voltmeter should have high resistance
(2) Ammeter should have low resistance
(3) Ammeter is placed in parallel across the conductor in a circuit
(4) Voltmeter is placed in parallel across the conductor in a circuit
A moving coil galvanometer has a resistance of 50 Ωand gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A :
(1) 50/99 Ω in series
(2) 50/99 Ω in parallel
(3) 0.01 Ω in series
(4) 0.01 Ω in parallel
The net resistance of a voltmeter should be large to ensure that :
| 1. | It does not get overheated |
| 2. | It draws excessive current |
| 3. | It can measure large potential difference |
| 4. | It does not appreciably change the potential difference to be measured |
A galvanometer having a resistance of \(8~\Omega\) is shunted by a wire of resistance \(2~\Omega\). If the total current is \(1~\text{A}\), the part of it passing through the shunt will be:
1. \(0.25~\text{A}\)
2. \(0.8~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.5~\text{A}\)
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