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examsarekillingme
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examsarekillingme
Asked: January 15, 2022In: Physics

An induced current has no no direction of its own. Explain

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  1. Anish LEVEL 1
    Added an answer on May 1, 2023 at 4:38 pm

    An induced current is a current that is produced in a conductor when there is a change in the magnetic field surrounding it. Unlike a direct current (DC), which flows continuously in one direction, an induced current is alternating in nature and changes direction periodically. The direction of an inRead more

    An induced current is a current that is produced in a conductor when there is a change in the magnetic field surrounding it. Unlike a direct current (DC), which flows continuously in one direction, an induced current is alternating in nature and changes direction periodically.

    The direction of an induced current is not determined by the current itself but is instead determined by the direction of the changing magnetic field that is causing the current. According to Faraday’s law of electromagnetic induction, the magnitude and direction of an induced current are proportional to the rate of change of the magnetic field. The induced current will flow in a direction such that it opposes the change in the magnetic field that produced it, as described by Lenz’s law.

    Therefore, the direction of the induced current is not determined by any intrinsic property of the current itself, but rather by the external factors that are causing it to be induced.

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Anonymous
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Anonymous
Asked: September 29, 2022In: Physics

If magnetic force does not work on charged particles, how can it have any effect on particle motion?

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  1. Anish LEVEL 1
    Added an answer on September 29, 2022 at 8:37 pm

    When a charged particle moves on uniform magnetic field (B), it experience a force F as F= Bqv sinΘ, where q is charge particle, v be its velocity and Θ be is angle between B and v. This force is acting toward the motion of the circle or motion is circular. The direction of force F and distance coveRead more

    When a charged particle moves on uniform magnetic field (B), it experience a force F as F= Bqv sinΘ, where q is charge particle, v be its velocity and Θ be is angle between B and v. This force is acting toward the motion of the circle or motion is circular. The direction of force F and distance covered s are always perpendicular to each other such that, work done W = FS cos90 = 0. so, the magnetic force does no work done but moves the particle in circular motion.

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Tmg enoch
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Tmg enochLEVEL 14
Asked: August 20, 2020In: Physics

A mass of 1 kg is attached to the lower end of a string 1 m long whose upper end is fixed . The mass is made to rotate in a horizontal circle of radius 60 cm . if the circular speed of the mass is constant , find the tension in the string and the period of motion .

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  1. Heman LEVEL 18
    Added an answer on August 27, 2020 at 12:28 pm

    Given , Mass of object (m) = 1kg  Length of string (l) = 4m Radius of circle (r) = 60cm Tension on the string (T) = ? Period of motion = ? From figure , Tsinθ = mv2/r Tcosθ =mg tanθ = v2/rg and  sinθ = r/l = 0.6/1 = 0.6 or , θ = sin-1(0.6) = 36.87 so from relation  Tcosθ =mg T = mg/cosθ =1x10/cos36.Read more

    Given ,
    Mass of object (m) = 1kg 
    Length of string (l) = 4m
    Radius of circle (r) = 60cm
    Tension on the string (T) = ?
    Period of motion = ?
    From figure ,
    Tsinθ = mv2/r
    Tcosθ =mg
    tanθ = v2/rg and 
    sinθ = r/l = 0.6/1 = 0.6
    or , θ = sin-1(0.6) = 36.87
    so from relation 
    Tcosθ =mg
    T = mg/cosθ =1×10/cos36.87 = 12.5 N
    Again , from relation 
    tanθ = v2/rg
    or , t = 2π√lcosθ/g
             = 2π√1xcos36.87/10 = 1.78s

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Tmg enoch
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Tmg enochLEVEL 14
Asked: August 22, 2020In: Physics

A charge oil drop remains stationary when situated between two parallel horizontal metal plates 25 mm apart and a p.d. of 1000v is applied to the plates . find the charge on the drop if it has mass of 5 x10^-15 kg.

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  1. Heman LEVEL 18
    Added an answer on August 23, 2020 at 9:17 pm

    Given, Separation of plates (d) =25mm Mass of drop (m) =5x10-15kg Potential difference (V) =1000v Charge on the drop (q) =? if the oil drop remains stationary , then  The force on oil drop due to electric field =weight of the drop  i.e. qE=mg or ,q =mg/E =mg/v/d =mgd/v         = 5x10-15x10x25x10-3/1Read more

    Given,
    Separation of plates (d) =25mm
    Mass of drop (m) =5×10-15kg
    Potential difference (V) =1000v
    Charge on the drop (q) =?
    if the oil drop remains stationary , then 
    The force on oil drop due to electric field =weight of the drop 
    i.e. qE=mg
    or ,q =mg/E =mg/v/d =mgd/v
            = 5×10-15x10x25x10-3/1000 =1.25×10-18c
    ∴The charge on the oil drop q =1.25×10-18c
    Hence the required charge on the oil drop is 1.25×10-18c.

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Ragas
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Ragas
Asked: June 17, 2020In: Physics

It can hurt our foot more to kick a big rock than a small pebble

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  1. Sagar poudel LEVEL 1
    Added an answer on June 17, 2020 at 12:40 pm

    A big rock has large mass than smaller pebble . Thus , the big rock has greater change in momentum than the pebble . When we kick to large rock , the change in momentum i.e. the force exerted by large rock is greater than smaller pebble . Due to this reason , it can hurt our foot more to kick a bigRead more

    A big rock has large mass than smaller pebble . Thus , the big rock has greater change in momentum than the pebble . When we kick to large rock , the change in momentum i.e. the force exerted by large rock is greater than smaller pebble . Due to this reason , it can hurt our foot more to kick a big rock than a small pebble .

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knowithere
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knowithereLEVEL 1
Asked: June 12, 2020In: Biology, Physics

Explain the working mechanism of a Petrol engine with the help of a PV diagram

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  1. Tmg enoch LEVEL 14
    Added an answer on July 27, 2020 at 1:49 pm

    The engine consist of fixed cylinder and a moving piston  . The expanding combustion gases push the piston , which in turn rotates the crankshaft . After the piston compress the fuel air mixture , the sparks ignites it , causing combustion . The expansion of the combustion  gases pushes the piston dRead more


    The engine consist of fixed cylinder and a moving piston  . The expanding combustion gases push the piston , which in turn rotates the crankshaft . After the piston compress the fuel air mixture , the sparks ignites it , causing combustion . The expansion of the combustion  gases pushes the piston during power stroke.

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sabigya
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sabigya
Asked: November 2, 2021In: Biology MCQs

In a taxonomic hierarchy, the number of common characters will increase we go form.

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(A). Class to Order (B). Species to Kingdom (C). Genus to Species (D). None of these

(A). Class to Order
(B). Species to Kingdom
(C). Genus to Species
(D). None of these

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  1. Heman LEVEL 16
    Added an answer on November 18, 2021 at 7:24 pm

    Option D is the correct answer!!!

    Option D is the correct answer!!!

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Question Bank
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Question BankLEVEL 1
Asked: December 21, 2020In: Computer MCQs

The flow of information through MIS is

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A) organization dependent B) information dependent C) management dependent D) need dependent

A) organization dependent
B) information dependent
C) management dependent
D) need dependent

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  1. knowithere LEVEL 21
    Added an answer on December 29, 2020 at 12:53 pm

    Option D is the correct answer!!! The flow of information through MIS - Management Information System is Need dependent.

    Option D is the correct answer!!!
    The flow of information through MIS – Management Information System is Need dependent.

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Anonymous
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Anonymous
Asked: May 14, 2020

What is the boiling point and freezing point of alchol

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  1. Neer Sharma LEVEL 1
    Added an answer on May 15, 2020 at 2:06 pm

    Boiling point is 78⁰C and freezing point   is - 117⁰C

    Boiling point is 78⁰C and freezing point   is – 117⁰C

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knowithere
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knowithereLEVEL 1
Asked: June 12, 2020In: Physics

A thin equiconvex lens of glass of refractive index 1.5 whose surfaces have a radius of curvature of 24cm is placed on a horizontal plane mirror. When the space between the lens and mirror is lilied with a liquid, a pin tied 40 cm vertically above the lens is found to coincide with its own image. Calculate the refractive index of the liquid. 

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  1. rohityadav LEVEL 1
    Added an answer on July 12, 2021 at 2:29 pm

    Answer:

    Answer:

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