A calibrated potentiometer is used to measure the e.m.f. of a cell because the
internal resistance of a cell is small compared with that of the potentiometer
potentiometer has a linear scale
potentiometer takes no current from the cell
resistance of the potentiometer is less than that of a voltmeter
Correct answer is C
No explanation has been provided for this answer.
0.20V
0.86V
1.71V
3.43V
Correct answer is B
Using voltage - divider method
v1 = \(\frac{(R_1)}{R_T}\)VT
= \(\frac{250}{1750}\) x \(\frac{6}{1}\)
= 0.86V
1.10 x 10-6\(\Omega\)m
4.25 x 10-6\(\Omega\)m
2.40 x 10-7\(\Omega\)m
1.70 x 10-8\(\Omega\)m
Correct answer is D
Resistance = \(\frac{\text{ Resistivity x Area}}{Area}\)
= 0.425 x 0.2 x 10-6
= 1.7 x 10-8\(\Omega\)m
A bar magnet is most effectively demagnetized by
placing it in a N - 5 position and hitting it with a hammer
subjecting it to an electric current from a battery
bringing its north pole in contact with the north pole of a very strong magnet
heating the magnet
Correct answer is A
No explanation has been provided for this answer.
is largest when they are arranged end to end
is greatest when they are arrangedparallel with like poles adjacent to each other
depends only on the number of magnets provided they arev parallel
is greater when the magnets are arranged on a wooden surface than on a metaln surface
Correct answer is A
No explanation has been provided for this answer.