Self Induction

Q. 113. A vector of length l is turned through the angle theta about its tail what is the change in the position vector of its head?

Q. Consider the conducting square loop shown in the figure. In the given adjacent circuit , the switch is closed and after some time it is opened again, the closed loop will show-

1. An anticlockwise current-pulse and then a clockwise current-pulse
2. A clockwise current-pulse
3. A clockwise current-pulse and then an anticlockwise current-pulse
4. An anticlockwise current-pulse

Q. What does The increase in magnitude of 2 on Richer scale

Q. The order of magnitude of 2^{20}will be

Q. 94.Find T1, T2 and T3

Q. Derive s=vt-1\2(at²)

Q. 114.An electric heater has three windings. If two windings are connected in parallel and third is connected to them in series, then with various combinations , the water in the vessel begins to boil in 40, 45 and 72 minutes. The time taken to begin boiling if all windings are connected in series is Ts and if all are connected in parallel is Tp. Find ((Ts:Tp)-4)

Q. Two electric bulbs whose resistances are in the ratio 1: 2 are connected in series to a constant voltage source. The power dissipated in them are in the ratio

Q.

The momentum in mechanics is expressed as $m$ x $v$. The analogous expression in electricity is

1. 

2. 

3. 

4. 

Q.

Two different coils have self-inductance $L_1$ = 8mH and $L_2$ = 2mH respectively. The current in both the coils is increased at a same rate. At a certain instant of time, the power being supplied to both the coils is equal. At that instant, the current, the induced voltage, and the energy stored in $L_1$ and $L_2$ are $I_1$ and $I_2$, $V_1$ and $V_2$, and $W_1$ and $W_2$ respectively. Then

1. $\frac{i_1}{i_2}=\frac{1}{4}$

2. $\frac{i_1}{i_2}=48$

3. $\frac{W_2}{W_1}=4$

4. $\frac{V_2}{V_1}=\frac{1}{4}$

Q. Why we have to take halfof the length of heavy object while finding its elongation.Explain in detail

Q. A coil of 100 turns carries a current of 5mA and creates a magnetic flux of ${10}^{-5}$ Weber. The inductance is

1. 0.2H
2. 2mH
3. 2H
4. 0.2mH

Q. What is the definition of one parsec?

Q. why there is l/t^{2 }in time period ?

Q. When a current changes from + 2A to – 2A in 0.05s, an emf of 8V induced in a coil. The coefficient of self induction of coil is:

1. 0.4H
2. 0.8H
3. 0.1H
4. 0.2H

Q. What is order of magnitude?

Q.

Two different coils have self-inductance $L_1$ = 8mH and $L_2$ = 2mH respectively. The current in both the coils is increased at a same rate. At a certain instant of time, the power being supplied to both the coils is equal. At that instant, the current, the induced voltage, and the energy stored in $L_1$ and $L_2$ are $I_1$ and $I_2$, $V_1$ and $V_2$, and $W_1$ and $W_2$ respectively. Then

1. $\frac{i_1}{i_2}=\frac{1}{4}$

2. $\frac{i_1}{i_2}=48$

3. $\frac{W_2}{W_1}=4$

4. $\frac{V_2}{V_1}=\frac{1}{4}$

Q. what is variable spe

Q. A magnetic flux of $5\mu \text{Wb}$ is linked with a coil when a current of $1\text{mA}$ flows through it. Find the self inductance of the coil?

1. $2\text{mH}$
2. $3\text{mH}$
3. $4\text{mH}$
4. $5\text{mH}$

Q. How to aplly w .e thn?

Q.

The momentum in mechanics is expressed as $m$ x $v$. The analogous expression in electricity is

1. 

2. 

3. 

4. 

Q. The value of 10N in CGS unit will be

Q.

The equivalent quantity of mass in electricity is

1. Charge

2. Potential

3. Inductance

4. Current

Q. how to find v_{max} for a bod

Q. What is Intensity

Q.

The coefficient of self inductance of a solenoid is $0.18$ mH. If a rod of soft iron of relative permeability 900 is inserted in it, then the coefficient of self inductance will become nearly

1. 5.4 mH

2. 162 mH

3. 0.006 mH

4. 0.0002 mH