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Asked/Added Questions From NCERT:


Question 1. Asked on :10 August 2020:05:16:38 PM

Why should the spring/suspension wire in a moving coil galvonometer have low torsonial constant?

-Added by Shruti Srivastva Physics » Magnetic Effects Of Current

Answer:

Shruti Srivastva
Low torsoinal constant of the suspension wire ensures high sensitivity of the moving coil galvonometer.

-Answered by Shruti Srivastva On 10 August 2020:05:18:18 PM


Question 2. Asked on :10 August 2020:05:14:11 PM

A student wants to increase the range of an ammeter from 1mA to 5mA. What should be done to the shunt resistance?

-Added by Shruti Srivastva Physics » Magnetic Effects Of Current

Answer:

Shruti Srivastva
The value of shunt resistance should be reduced so that more current may pass through it.

-Answered by Shruti Srivastva On 10 August 2020:05:15:37 PM


Question 3. Asked on :10 August 2020:05:11:24 PM

Suppose a shunt of resistance 0.01Ω is connencted across a galvonometer, what can be said aboyt the resistance of the resulting ammeter?


-Added by Shruti Srivastva Physics » Magnetic Effects Of Current

Answer:

Shruti Srivastva

The resistance of the resulting ammeter will be less than 0.01Ω.

-Answered by Shruti Srivastva On 10 August 2020:05:13:19 PM


Question 4. Asked on :10 August 2020:05:07:34 PM

What is the eective resistance of an ammeter if a shunt of resistance Rs is used acroos the terminals of a galvonometer of resistance Rg?

-Added by Shruti Srivastva Physics » Magnetic Effects Of Current

Answer:

Shruti Srivastva

Effective resistance of ammeter, RA = RRgRs+Rg .

-Answered by Shruti Srivastva On 10 August 2020:05:09:28 PM


Question 5. Asked on :10 August 2020:05:03:28 PM

Why should a voltmeter have a low current carrying capacity?

-Added by Shruti Srivastva Physics » Magnetic Effects Of Current

Answer:

Shruti Srivastva
Due to low current capacity, the voltmeter will draw only a small part of the total current. The potential diference to be measured will not be much different from the actual value.


-Answered by Shruti Srivastva On 10 August 2020:05:04:59 PM


 

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