The net resistance of a voltmeter should be large to ensure that:
 

1.	It does not get overheated.
2.	It does not draw excessive current.
3.	It can measure large potential differences.
4.	It does not appreciably change the potential difference to be measured.

A circular loop of area \(1\) cm², carrying a current of \(10\) A, is placed in a magnetic field of \(0.1\) T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is:
1. zero
2. \(10^{-4}\) N-m
3. \(10^{-2}\) N-m
4. \(1\) N-m

A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible?

Choose the correct option:

A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth's magnetic field, the electron beam will be deflected:

A wire carrying a current \(I_0\) oriented along the vector \(\big(3\hat{i}+4\hat{j}\big)\) experiences a force per unit length of \(\big(4F\hat{i}-3F\hat{j}-F\hat{k}\big).\) The magnetic field \(\vec{ B}\) equals:

1. \(\dfrac{F}{I_0}\left(\hat{i}+\hat{j}\right)\)

2. \(\dfrac{5F}{I_0}\left(\hat{i}+\hat{j}+\hat{k}\right)\)

3. \(\dfrac{F}{I_0}\left(\hat{i}+\hat{j}+\hat{k}\right)\)

4. \(\dfrac{5F}{I_0}\hat{k}\)