Tag: physics

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Questions Related to physics

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

Which of the following entities are closely associated to each other

  1. Gravitation and nuclear fusion

  2. Electricity and magnetism

  3. Chemical Bonding and Planetary motion

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electric current and magnetism are very closely related phenomenon and both can be generated using the other.

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

Define Electromagnetism

  1. The study of attraction or repulsion between two magnets is called electromagnetism

  2. The study of electric effects due to magnetic interaction is called electromagnetism

  3. The study of magnetic effects produced due to electric current is called electromagnetism

  4. The study of magnetic effects produced due to electric charge is called electromagnetism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electromagnetism is study of various phenomenon related to electricity and magnetism. 

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

Which of the following phenomenon can be related to electric current 

  1. Magentism

  2. Gravitation

  3. Nuclear Fission

  4. Chemical Bonding
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electric current and magnetism are very closely related phenomenon and both can be generated using the other.

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

The Magnetic effect of current was discovered by:

  1. John Ambrose Fleming

  2. Hans Christian Oersted

  3. Michael Faraday

  4. André-Marie Ampère
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The magnetic effect of an electric current was discovered by Hans Christian Oersted in 1820. He demonstrated the effect by plotting compass close to a long straight wire which is carrying current and noting it's deflection. And the by reversing the direction of the current, the compass needle was deflected in the opposite sense.

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

How can you determine direction of magnetic field lines around a current carrying conductor

  1. Left hand Thumb Rule

  2. Right Hand Thumb Rule

  3. By rotating the conductor

  4. Using sonometer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Direction of magnetic field lines around a current carrying conductor can be found by RIght Hand Thumb Rule.

Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment field due to a current carrying conductor magnetic field due to a straight current carrying conductor magnetic field lines due to current

One metal wire is kept in east-west direction.  $I$  is the current flow due west. Then, due to magnetic field  $\vec { { B } }$  of the earth on the wire is in the........ Direction.

  1. downward

  2. Upward

  3. north

  4. south
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
according to left hand rule. if current is in west direction then magnetic field will be north direction, if force is in north west direction
Multiple choice physics electromagnetism magnetic field due to a circular current carrying conductor magnetic field produced in a circular loop field due to a current carrying coil oersted experiment

The shape of a magnetic field lines around a straight current carrying conductor is.......

  1. Circular

  2. Straight line

  3. Curved

  4. Parabolic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the right-hand rule, the magnetic field lines around a straight current-carrying conductor form concentric circles centered on the wire.

Multiple choice physics alternating currents sinusoidal current types of current movement of charge

A 220 V, 50 Hz AC source is connected to an inductance of 0.2 H and resistance of 20 $\Omega$ in series. The current in the circuit is :

  1. $3.33 A$

  2. $33.3 A$

  3. $15 A$

  4. $5 A$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Given, V =220 volts, f=50 Hz, L =0.2 H, R = 20 $\Omega$


$X _L =2\pi fL=2 \times 3.14 \times 50 \times 0.2$

$= 100 \times  0.628 = 62.80\Omega$

$Z = \sqrt{X^2 _L + R^2} = \sqrt{(62.8)^2 + 20^2}$

$I = \displaystyle \frac{V}{Z} = \frac{220}{\sqrt{43473.84}} = 3.33A$

Multiple choice physics alternating currents sinusoidal current types of current movement of charge

An alternating voltage $E=200\sqrt{2}\sin (100t)$ is connected to $1$ microfarad capacitor through AC ammeter. The reading of ammeter shall be.

  1. $10$mA

  2. $20$mA

  3. $40$mA

  4. $80$mA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Reading of ammeter $=I _{rms}=\displaystyle \frac{V _{rms}}{X _C}=\frac{V _0\omega C}{\sqrt 2}$
$=\displaystyle\frac{200\sqrt 2\times 100\times (1\times 10^{-6})}{\sqrt 2}=2\times 10^{-2} A$
$=20 mA$