Match the following :
`{:(" Column I"," Column II"),("(A) Steady electric field","(p) Can accelerate a stationary charge"),("(B) Steady magnetic field","(q) Can accelerate a moving charge"),("(C) Time varying magnetic field","(r) Can change the speed of a charge"),("(D) Induced electric field","(s) Forms closed loops"):}`,

Answer

To solve the matching question, we will analyze each option in Column I and find the appropriate match from Column II based on the principles of electromagnetism.

### Step-by-Step Solution:

1. **Analyze Option A: Steady Electric Field**
- A steady electric field can exert a force on a charge. The force \( F \) on a charge \( Q \) in an electric field \( E \) is given by \( F = QE \).
- This force can accelerate both stationary and moving charges.
- Therefore, it matches with:
- (p) Can accelerate a stationary charge
- (q) Can accelerate a moving charge
- (r) Can change the speed of a charge
- **Conclusion**: A matches with P, Q, R.

2. **Analyze Option B: Steady Magnetic Field**
- A steady magnetic field does not exert a force on stationary charges (since \( V = 0 \) leads to \( F = 0 \)).
- However, it can exert a force on moving charges, given by \( F = Q(V \times B) \).
- The force acts perpendicular to the velocity, changing the direction but not the speed of the charge.
- Therefore, it matches with:
- (q) Can accelerate a moving charge
- (s) Forms closed loops (magnetic field lines form closed loops)
- **Conclusion**: B matches with Q, S.

3. **Analyze Option C: Time Varying Magnetic Field**
- A time-varying magnetic field can induce an electric field (Faraday's Law of Induction).
- Similar to a steady magnetic field, it cannot accelerate a stationary charge.
- It can accelerate a moving charge and also forms closed loops.
- Therefore, it matches with:
- (q) Can accelerate a moving charge
- (s) Forms closed loops
- **Conclusion**: C matches with Q, S.

4. **Analyze Option D: Induced Electric Field**
- An induced electric field can exert a force on both stationary and moving charges.
- It can accelerate both types of charges and can change their speed.
- It can also form closed loops in the case of eddy currents.
- Therefore, it matches with:
- (p) Can accelerate a stationary charge
- (q) Can accelerate a moving charge
- (r) Can change the speed of a charge
- (s) Forms closed loops
- **Conclusion**: D matches with P, Q, R, S.

### Final Matching:
- A → P, Q, R
- B → Q, S
- C → Q, S
- D → P, Q, R, S