A galvanometer has a coil resistance of 100 Ω and gives a full-scale deflection for 30 mA of current. If it is to work as a voltmeter in the 30 V range, how much resistance does it require to be added?
1. 900
2. 1800
3. 500
4. 1000
A square current-carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is \( \overrightarrow{F}\), what will be the net force on the remaining three arms of the loop?
1. | \(3 \overrightarrow{F}\) | 2. | \(- \overrightarrow{F}\) |
3. | \(-3 \overrightarrow{F}\) | 4. | \( \overrightarrow{F}\) |
Under the influence of a uniform magnetic field, a charged particle moves with constant speed \(v\) in a circle of radius \(R.\) The time period of rotation of the particle:
1. | depends on \(v\) and not on \(R.\) |
2. | depends on R and not on \(v.\) |
3. | is independent of both \(v\) and \(R.\) |
4. | depends on both \(v\) and \(R.\) |
1. | 8 N in - z-direction. |
2. | 4 N in the z-direction. |
3. | 8 N in the y-direction. |
4. | 8 N in the z-direction. |
1. | Putting in parallel, a resistance of \(24~ \Omega\) |
2. | Putting in series, a resistance of \(15~ \Omega\) |
3. | Putting in series, a resistance of \(240~ \Omega\) |
4. | Putting in parallel, a resistance of \(15~ \Omega\) |
A closed-loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR, and RQ are F1, F2, and F3 respectively, and are in the plane of the paper and along the directions shown,
then which of the following forces acts on the segment QP?
1.
2.
3.
4.
A particle of mass \(m\), charge \(Q\), and kinetic energy \(T\) enters a transverse uniform magnetic field of induction \(\vec B\). What will be the kinetic energy of the particle after seconds?
1. | \(3~\text{T}\) | 2. | \(2~\text{T}\) |
3. | \(\text{T}\) | 4. | \(4~\text{T}\) |
The resistance of an ammeter is 13 Ω and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter, it becomes possible to measure currents up to 750 A by this ammeter. The value of shunt resistance is:
1. 20
2. 2
3. 0.2
4. 2 k
Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius R with constant speed v. The time period of the motion:
1. depends on v and not on R.
2. depends on both R and v.
3. is independent of both R and v.
4. Depends on R and not on v.