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Anurag Verma

Jul 28, 2014

#### A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?



In the case of a hollow metal sphere, the electric field inside the shell is zero. This means that the potential inside the shell is constant. Therefore the pot...

Amarnathreddy M

Feb 1, 2014



Feb 23, 2015

#### What is a ballistic galvanometer and what is its principle?



A ballistic galvanometer is a galvanometer specially designed to measure the quantity of charge displaced in a current of short duration (such as in the chargin...

Anubhav Singh

Dec 23, 2014

#### The angular momentum of an electron in a hydrogen atom is proportional to (where r is radius of orbit ): a) 1/r1/2                             b) 1/r c) r1/2                               d) r2



Radius of the nth orbit rn ∝ n2/Z      ⇒    n &#...

Altaf Hussain Shaikh Ahmed

Mar 19, 2015



Vaibhav Gumber

Jun 1, 2015



Misha Jain

Aug 15, 2014

#### Equation of alternating current is given by I = 10√2 sin(100πt + π/6). If the time taken by current to reach the root mean square value from t=0 is t',  then what is the value of t'?



Instantaneous value of current I = 10√...

Arunima Ajan

Nov 21, 2014



Misha Jain

Aug 15, 2014

#### The phase difference between current and voltage in an AC circuit is π/4 radian. If the frequency of AC is 50 Hz, then the phase difference is equivalent to the time difference of how many seconds?



Phase difference ϕ = π/4 radian
Frequency f = 50 Hz
Time difference Δt = ϕ/(2πf)
= π/(4 x 2π x 50)
= 1/(400)
= 0.0025 s
...

Harsha

Apr 12, 2014

#### a proton is placed in a uniform electric field directed along positive x axis .in which direction will it tend to move?



The proton will move in the direction of the electric field that is the +ve X-axis to –ve X axis. proton moves in direction of the elec...

Anurag Verma

Jul 28, 2014

#### A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?



In the case of a hollow metal sphere, the electric field inside the shell is zero. This means that the potential inside the shell is constant. Therefore the pot...

Amarnathreddy M

Feb 1, 2014



Feb 23, 2015

#### What is a ballistic galvanometer and what is its principle?



A ballistic galvanometer is a galvanometer specially designed to measure the quantity of charge displaced in a current of short duration (such as in the chargin...

Anubhav Singh

Dec 23, 2014

#### The angular momentum of an electron in a hydrogen atom is proportional to (where r is radius of orbit ): a) 1/r1/2                             b) 1/r c) r1/2                               d) r2



Radius of the nth orbit rn ∝ n2/Z      ⇒    n &#...

Altaf Hussain Shaikh Ahmed

Mar 19, 2015



Vaibhav Gumber

Jun 1, 2015



Misha Jain

Aug 15, 2014

#### Equation of alternating current is given by I = 10√2 sin(100πt + π/6). If the time taken by current to reach the root mean square value from t=0 is t',  then what is the value of t'?



Instantaneous value of current I = 10√...

Arunima Ajan

Nov 21, 2014



Misha Jain

Aug 15, 2014

#### The phase difference between current and voltage in an AC circuit is π/4 radian. If the frequency of AC is 50 Hz, then the phase difference is equivalent to the time difference of how many seconds?



Phase difference ϕ = π/4 radian
Frequency f = 50 Hz
Time difference Δt = ϕ/(2πf)
= π/(4 x 2π x 50)
= 1/(400)
= 0.0025 s
...

Harsha

Apr 12, 2014