Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
3 x 10-5
3 x 10-6
5 x 105
5 x 10-5
Correct answer is D
since the wires are parallel to each other, the forces which they exert on each other are equal and opposite, since they must agree with newton's law of action an reaction. Hence the force exerted by the wire is equally
5 x 10-5
The instrument that measures both ac and dc is called
A current balance
a moving coil ammeter
a moving iron ammeter
an inverter
Correct answer is C
No explanation has been provided for this answer.
4.0 x 102W
5.0 x 102W
4.0 x 103W
5.0 x 103W
Correct answer is D
In general, Power = IV; \( \implies 40KW = IV \\
\text{Therefore } 40000 = 1 \times 800\\
\implies I = \frac{40000}{800} = 50A,\text{tune the current through} \)
Resistor = 50A
power loss= I2R = 502 x 2
= 2500 x 2 = 5.0 x 103W
2.55 * 105 Ωm
2.55 * 103 Ωm
3.93 * 10-6 Ωm
3.93 * 10-8 Ωm
Correct answer is D
\( R = \frac{1}{a} p \implies p = \frac{R.a}{1} = \frac{0.1 \times 3.14}{2} \left ( \frac{10^{-3}}{2} \right)^2 \\
\text{Therefore } p = \frac{0.1 \times 3.14 \times 10^{-6}}{2 \times 4} \\
= 0.3925 \times 10^{-7} \text{ OR } -3.930 \times 10 ^{-8}Ωm \)
0.8j
1.8j
9.0j
18.0j
Correct answer is B
Workdone = product of the charge Q, and the p.d V.
i.e Work done = QV
= 600 * 10-6 *2.1 * 103
=1.8j